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ORDINARY SHARES - Additional Information (Details)
¥ in Thousands
 12 Months Ended
May 10, 2020
shares
May 10, 2019
CNY (¥)
Vote
shares
Dec. 19, 2018
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
May 10, 2019
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Common shares, par value | $ / shares           $ 0.000000005  
Common shares, shares outstanding           216,100,000  
Ordinary shares, split description       the Company completed a two for one split of ordinary share authorized and outstanding to 20,000 ordinary shares.      
Ordinary shares split ratio     20,000        
Stock sale price | $ / shares           $ 10.50  
IPO Expenses Capitalization | ¥   ¥ 234,354          
Common Class A [Member]              
Common shares, shares authorized       10,000,000,000,000 10,000,000,000,000    
Common shares, par value | $ / shares       $ 0.000000005 $ 0.000000005    
Common shares, shares outstanding       108,100,000 100,100,000 100,100,000  
Common Stock, Shares, Issued       108,100,000 100,100,000    
Stock issued during period         16,100,000    
Number of votes | Vote   1          
Conversion of Class B Ordinary Share to Class A Ordinary Share       8,000,000      
Common Class B [Member]              
Common shares, shares authorized       10,000,000,000,000 10,000,000,000,000    
Common shares, par value | $ / shares       $ 0.000000005 $ 0.000000005    
Common shares, shares outstanding       108,000,000 116,000,000 116,000,000  
Common Stock, Shares, Issued       108,000,000 116,000,000    
Number of votes | Vote   10          
Conversion of Class B Ordinary Share to Class A Ordinary Share       (8,000,000)      
ADS              
Stock issued during period 4,025,000            
Common Stock              
Stock issued during period   16,100,000          
Jiayin Group Inc and Subsidiaries              
Common shares, shares authorized             500,000,000
Common shares, par value | $ / shares             $ 0.0001
Common shares, shares outstanding             10,000
Common Stock, Shares, Issued             10,000