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Accounts receivable, net (Details 1)
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Credit Loss [Abstract]      
Beginning balance $ 705,060 ¥ 4,862,941 ¥ 1,886,467
Provision for doubtful accounts 38,708 274,155 2,976,474
Exchange rate difference (95,882)
Ending balance $ 647,886 ¥ 4,588,786 ¥ 4,862,941