Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form F-3 of our reports dated April 19, 2021, relating to the financial statements of Canadian Solar Inc. and the effectiveness of Canadian Solar Inc.’s internal control over financial reporting, appearing in the Annual Report on Form 20-F for the year ended December 31, 2020. We also consent to the reference to us under the heading “Experts” in such Registration Statement.

/s/ Deloitte Touche Tohmatsu Certified Public Accountants LLP

Shanghai, China

May 27, 2021