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Prepayments and Other Current Assets (Tables)
 6 Months Ended
Jun. 30, 2020
Prepaid Expenses And Other Current Assets Disclosure [Abstract]  
Schedule of prepayments and other current assets
   June 30,   December 31, 
   2020   2019 
Prepaid land lease  $169,504   $301,023 
Prepayment for purchase of materials   60,510    5,394,297 
Value-added tax recoverable   5,408,783    5,666,975 
Others   235,845    250,946 
   $5,874,642   $11,613,241