Report of Foreign Issuer (6-k)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 OF THE

SECURITIES EXCHANGE ACT OF 1934

For the month of July 2019

Commission File Number 001-34873

ChinaCache International Holdings Ltd.

(Translation of registrant’s name into English)

Section A, Building 3, Dian Tong Creative Square

No. 7 Jiuxianqiao North Road, Chaoyang District

Beijing, 100015, China

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F: Form 20-F x Form 40-F ¨

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ¨

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ¨

CHANGE IN INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

ChinaCache International Holdings Ltd. (the “Company”) is furnishing this current report on Form 6-K to report that on July 12, 2019, the Company engaged Marcum Bernstein Pinchuk LLP (“Marcum”) as the Company’s independent registered public accounting firm. The decision was approved by the Company’s Audit Committee.

During the Company’s most recent two fiscal years and through the subsequent interim period on or prior to July 12, 2019, neither the Company nor anyone on its behalf has consulted with Marcum on either (a) the application of accounting principles to a specified transaction, either completed or proposed, or the type of audit opinion that might be rendered on the Company’s financial statements, and neither a written report nor oral advice was provided to the Company by Marcum that Marcum concluded was an important factor considered by the Company in reaching a decision as to any accounting, auditing or financial reporting issue , or (b) any matter that was the subject of a disagreement, as that term is defined in Item 16F(a)(1)(iv) of Form 20-F (and the related instructions thereto) or a reportable event as set forth in Item 16F(a)(1)(v)(A) through (D) of Form 20-F.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.