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Cover Page
 12 Months Ended
Dec. 31, 2020
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2020
Document Fiscal Year Focus 2020
Document Fiscal Period Focus FY
Entity Registrant Name Jiayin Group Inc.
Entity Central Index Key 0001743102
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Filer Category Non-accelerated Filer
Entity Voluntary Filers No
Entity Shell Company false
Entity Emerging Growth Company true
Entity Ex Transition Period true
Entity Interactive Data Current Yes
Document Accounting Standard U.S. GAAP
Entity Address, Address Line One 18th Floor, Building No. 1, Youyou Century Plaza
Entity Address, Address Line Two 428 South Yanggao Road
Entity Address, Address Line Three Pudong New Area
Entity Address, City or Town Shanghai
Entity Address, Postal Zip Code 200122
Entity Incorporation, State or Country Code F4
Entity Address, Country CN
Document Annual Report true
Document Transition Report false
Entity File Number 001-38806
Trading Symbol JFIN
Title of 12(b) Security American Depositary Shares
Security Exchange Name NASDAQ
Document Shell Company Report false
Document Registration Statement false
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line One 18th Floor, Building No. 1, Youyou Century Plaza
Entity Address, Address Line Two 428 South Yanggao Road
Entity Address, Address Line Three Pudong New Area
Entity Address, City or Town Shanghai
Entity Address, Postal Zip Code 200122
Entity Address, Country CN
Contact Personnel Name Bei Bai
Local Phone Number 6190-6826
City Area Code 21
Contact Personnel Email Address baibei@jiayinfintech.cn
Business Contact Two  
Document Information [Line Items]  
Contact Personnel Name Jin Chen
Contact Personnel Email Address chenjin1@jiayinfintech.cn
Common Class A [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 108,100,000
Common Class B [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 108,000,000