POWER OF ATTORNEY

        The undersigned hereby constitutes and appoints each of Paul Hastings,
Chief Executive Officer of Nkarta, Inc., a Delaware corporation (the "Company"),
Nadir Mahmood, Chief Financial and Business Officer of the Company, and Alicia
Hager, Chief Legal Officer of the Company, the undersigned's true and lawful
attorney-in-fact to:

            1  execute for and on behalf of the undersigned, in the
               undersigned's capacity as an officer and/or director of the
               Company, Forms 3, 4, and 5 in accordance with Section 16(a) of
               the Securities Exchange Act of 1934, as amended and the rules
               thereunder (the "Exchange Act"), and/or authenticating documents
               pursuant to the rules governing the SEC's EDGAR Filer Management
               and application thereto;

            2  do and perform any and all acts for and on behalf of the
               undersigned which may be necessary or desirable to complete and
               execute any such Form 3, 4, or 5, complete and execute any
               amendment or amendments thereto, and timely file such form with
               the United States Securities and Exchange Commission and any
               stock exchange or similar authority; and

            3  take any other action of any type whatsoever in connection with
               the foregoing which, in the opinion of such attorney-in-fact, may
               be of benefit to, in the best interest of, or legally required
               by, the undersigned, it being understood that the documents
               executed by such attorney-in-fact on behalf of the undersigned
               pursuant to this Power of Attorney shall be in such form and
               shall contain such terms and conditions as such attorney-in-fact
               may approve in such attorney-in-fact's discretion.

        The undersigned hereby grants to such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this power of attorney and the rights and powers herein
granted.

        The undersigned acknowledges that:

            1  neither the Company nor the foregoing attorney-in-fact assumes
               (i) any liability for the undersigned's responsibility to comply
               with the requirement of the Exchange Act, (ii) any liability of
               the undersigned for any failure to comply with such requirements
               or (iii) any obligation or liability of the undersigned for
               profit disgorgement under Section 16(b) of the Exchange Act; and

            2  this Power of Attorney does not relieve the undersigned from
               responsibility for compliance with the undersigned's obligations
               under the Exchange Act, including without limitation the
               reporting requirements under Section 16 of the Exchange Act.

        This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, and 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company
unless earlier revoked by the undersigned in a signed writing delivered to each
attorney-in-fact.

                     [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK.]


        IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of this 16th day of November, 2020.


                                          /s/ Simeon George
                                        ---------------------------------
                                        SIMEON GEORGE