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Accounts receivable, net (Tables)
 12 Months Ended
Dec. 31, 2023
Credit Loss [Abstract]  
Schedule of accounts receivable, net
                       
    December 31,
2022		     December 31,
2023		     December 31,
2023		  
    RMB     RMB     USD  
Accounts receivable     85,215,404       14,431,613       2,037,586  
Less: allowance for doubtful accounts     (4,862,941 )     (4,588,786 )     (647,886 )
Accounts receivable, net     80,352,463       9,842,827       1,389,700  
Schedule of allowance for doubtful accounts
                       
    December 31,
2022		     December 31,
2023		     December 31,
2023		  
    RMB     RMB     USD  
Beginning balance     1,886,467       4,862,941       705,060  
Provision for doubtful accounts     2,976,474       274,155       38,708  
Exchange rate difference     -       -       (95,882 )
Ending balance     4,862,941       4,588,786       647,886