Exhibit 12.1



CERTIFICATION OF PRINCIPAL EXECUTIVE
OFFICER PURSUANT TO

EXCHANGE ACT RULE 13A-14(A)/15D-14(A)

AS ADOPTED PURSUANT TO SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002



I, Min Hu, certify that:



1. I have reviewed this Amendment No. 1
to the Annual Report on Form 20-F/A of Golden Bull Limited;



2. Based on my knowledge, this report does
not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in
light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;



3. Based on my knowledge, the financial
statements, and other financial information included in this report, fairly present in all material respects the financial condition,
results of operations and cash flows of the registrant as of, and for, the periods presented in this report;



4. The registrant’s other certifying
officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act
Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)
for the company and have:



(a) Designed such disclosure controls and
procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information
relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly
during the period in which this report is being prepared;



(b) [intentionally omitted];



(c) Evaluated the effectiveness of the
registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the
disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and



(d) Disclosed in this report any change
in the registrant’s internal control over financial reporting that occurred during the period covered by the annual report
that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial
reporting; and



5. The registrant’s other certifying
officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s
auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):



(a) All significant deficiencies and material
weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect
the registrant’s ability to record, process, summarize and report financial information; and



(b) Any fraud, whether or not material,
that involves management or other employees who have a significant role in the registrant’s internal control over financial
reporting.



|Date: August 6, 2020 | /s/ Min Hu                                                   
|-------------------- | -------------------------------------------------------------
|                     | Min Hu                                                       
|                     | Chief Executive Officer
        (Principal Executive Officer)