the present invention provides a high - flux polyamide composite membrane , which includes a composite membrane body , wherein the composite membrane body includes a non - woven fabric , a porous supporting layer and a polyamide layer which are successively arranged ; and the polyamide layer is prepared by a polyamine solution and a poly - acyl chloride solution through an interface polymerization reaction , wherein the polyamine solution contains amino acid . the amino acid adopted in the technical solution of the present invention can be used as an end - capping reagent to react with acyl chloride groups , thereby regulating a polyamide layer structure , decreasing a cross - linking degree of the polyamide layer , and opening a channel for the passing of water molecules ; and moreover , the hydrophilic performance of a membrane surface can also be improved , and a water flux is increased while a high interception rate is ensured .