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Prepayments and other current assets (Details) - Schedule of prepayments and other current assets - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Schedule of prepayments and other current assets [Abstract]    
Prepaid land lease $ 185,756 $ 183,912
Prepayment for purchase of materials 8,838,734 10,945
Value-added tax recoverable 5,935,486 5,864,989
Others 287,132 991,669
Total $ 15,247,108 $ 7,051,515