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Summary of significant accounting policies (Details Narrative)
12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
CNY (¥)
Accounting Policies [Abstract]          
Cash and cash equivalents   ¥ 151,119,985 ¥ 48,006,979 $ 17,795,126 ¥ 126,037,538
Working capital   ¥ 158,339,349     134,894,390
Foreign cuurency transactions 7.0467 RMB 6.7290 USD 1.00 to RMB 6.3721    
Doubtful accounts for accounts receivable   ¥ 4,862,941     4,588,786
Inventory Valuation Reserves   176,459     ¥ 176,459
Allowance for noncurrent prepayments and deposits   3,300      
Advertising expense ¥ 2,727,591 3,735,551 ¥ 148,521    
Government subsidies 844,332 478,809 76,988    
Total expenses ¥ 1,512,164 ¥ 4,630,467 ¥ 3,414,706