Exhibit 8.2

SKADDEN, ARPS, SLATE, MEAGHER & FLOM LLP

300 SOUTH GRAND AVENUE

LOS ANGELES, CALIFORNIA 90071-3144                  TEL: (213) 687-5000 FAX: (213) 687-5600 www.skadden.com       April 2, 2014 FIRM/AFFILIATE OFFICES                  BOSTON CHICAGO HOUSTON NEW YORK PALO ALTO SAN FRANCISCO WASHINGTON, D.C. WILMINGTON                  BEIJING BRUSSELS FRANKFURT HONG KONG LONDON MOSCOW MUNICH PARIS SÃO PAULO SHANGHAI SINGAPORE SYDNEY

Cheetah Mobile Inc.

12/F, Fosun International Center Tower

No. 237 Chaoyang North Road

Chaoyang District, Beijing 100022

People’s Republic of China

Re: American Depositary Shares of Cheetah Mobile Inc. (the “Company”, formerly known as Kingsoft Internet Software Holdings Limited)

Ladies and Gentlemen:

You have requested our opinion as special United States counsel concerning the statements in the Registration Statement (as described below) under the caption “Taxation—United States Federal Income Tax Considerations” in connection with the public offering of certain American Depositary Shares (“ADSs”), which represent Class A ordinary shares, par value $0.000025 per share, of the Company, pursuant to the registration statement on Form F-1 under the Securities Act of 1933, as amended (the “Act”), originally filed by the Company with the Securities and Exchange Commission (the “Commission”) on April 2, 2014 (the “Registration Statement”).

This opinion is being furnished to you pursuant to Exhibit 8.2 of the Exhibit Index of the Registration Statement.

In connection with rendering the opinion set forth herein, we have examined and relied on originals or copies of the following:

(a) the Registration Statement; and

(b) such other documents, certificates, and records as we have deemed necessary or appropriate as a basis for the opinion set forth herein.

Cheetah Mobile Inc.

April 2, 2014

Page 2

Our opinion is conditioned on the initial and continuing accuracy of the facts, information and analyses set forth in such documents, certificates, and records (as identified in clauses (a) and (b) of the immediately preceding paragraph). All capitalized terms used but not otherwise defined herein shall have the respective meanings set forth in the Registration Statement.

For purposes of our opinion, we have assumed the legal capacity of all natural persons, the genuineness of all signatures, the authenticity of all documents submitted to us as originals, the conformity to original documents of all documents submitted to us as certified, conformed, electronic, or photostatic copies, and the authenticity of the originals of such latter documents. We have relied on a representation of the Company that such documents, certificates, and records are duly authorized, valid and enforceable.

In addition, we have relied on factual statements and representations of the officers and other representatives of the Company and others, and we have assumed that such statements and representations are and will continue to be correct without regard to any qualification as to knowledge or belief.

Our opinion is based on the Internal Revenue Code of 1986, as amended, United States Treasury regulations, judicial decisions, published positions of the United States Internal Revenue Service, and such other authorities as we have considered relevant, all as in effect as of the date of this opinion and all of which are subject to differing interpretations or change at any time (possibly with retroactive effect). A change in the authorities upon which our opinion is based could affect the conclusions expressed herein. There can be no assurance, moreover, that the opinion expressed herein will be accepted by the United States Internal Revenue Service or, if challenged, by a court.

Based on and subject to the foregoing, we are of the opinion that, under current United States federal income tax law, although the discussion set forth in the Registration Statement under the heading “Taxation — United States Federal Income Tax Considerations” does not purport to summarize all possible United States federal income tax considerations of the ownership and disposition of ADSs to U.S. holders (as defined therein), such discussion constitutes, in all material respects, a fair and accurate summary of the United States federal income tax consequences of the ownership and disposition of the ADSs that are anticipated to be material to U.S. holders who purchase the ADSs pursuant to the Registration Statement, subject to the qualifications set forth in such discussion.

This opinion is furnished to you in connection with the sale of the securities. Except as set forth herein, we express no opinions or views regarding the United States federal income tax consequences of any transaction. Our opinion is expressed as of the date hereof, and we are under no obligation to supplement or revise our opinion to reflect any legal developments or factual matters arising subsequent to the date hereof or the impact of any information, document, certificate, record, statement, representation, covenant, or assumption relied upon herein that becomes incorrect or untrue.

Cheetah Mobile Inc.

April 2, 2014

Page 3

We hereby consent to the prospectus discussion of this opinion, to the filing of this opinion as an exhibit to the Registration Statement and to the use of our name under the captions “Taxation” and “Legal Matters” in the prospectus included in the Registration Statement. In giving such consent, we do not thereby admit that we are within the category of persons whose consent is required under Section 7 of the Act or the rules or regulations of the Commission promulgated thereunder.

Very truly yours,

/s/ Skadden, Arps, Slate, Meagher & Flom LLP