Exhibit 23.1

勤業眾信 勤業眾信聯合會計師事務所 11073台北市信義區松仁路100號20樓   Deloitte & Touche 20F, Taipei Nan Shan Plaza No. 100, Songren Rd., Xinyi Dist., Taipei 11073, Taiwan   Tel:+886 (2) 2725-9988 Fax:+886 (2) 4051-6888 www.deloitte.com.tw

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form F-3 of our report dated April 16, 2020 relating to the consolidated financial statements of ASLAN Pharmaceuticals Limited and its subsidiaries (the “Company”), appearing in the Annual Report on Form 20-F of the Company for the year ended December 31, 2019. We also consent to the reference to us under the heading “Experts” in such Registration Statement.

/s/ Deloitte & Touche

Deloitte & Touche

Taipei, Taiwan

Republic of China

January 29, 2021