An automatic design system for a customized product includes: a client processing module, a product design specification call module, a vendor processing module, and a computing module, where the client processing module reads demand specification information of a customized product, output a 3D physical design drawing, output a quotation, and read a confirmation order; the product design specification call module inputs a product design specification database; the vendor processing module outputs actual specification information of the customized product and manufacturing and processing information of the customized product to a vendor; and the computing module calls the product design specification database according to the demand specification information of the customized product to determine the actual specification information of the customized product, and generate the manufacturing and processing information of the customized product according to the actual specification information of the customized product.
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