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Property, Plant and Equipment (Details) - Schedule of property, plant and equipment - USD ($)
Dec. 31, 2020
Mar. 31, 2020
Schedule of property, plant and equipment [Abstract]    
Permit of land use $ 431,681 $ 428,633
Building 10,024,303 9,953,521
Plant, machinery and equipment 29,018,708 28,808,800
Motor vehicle 329,660 327,332
Office equipment 259,175 257,345
Total 40,063,527 39,775,631
Less: accumulated depreciation (24,499,327) (25,007,914)
Property, plant and equipment, net $ 15,564,200 $ 14,767,717