The invention relates to an integrated molding and pouring process for semi-enclosed glass fiber reinforced plastic products with infolded flanges. The process comprises the steps of: first, producing a mould, wherein the mould consists of a main body part and a flange part, a positioning and locking part is embedded at the side of the main body part in advance; the flange part is provided with a locking structure corresponding to the position of the positioning and locking part, and is fixed on the main body part by the positioning and locking part; second, paving a product framework on the inner wall of the mould; third, paving one sealing film layer on the surface of the framework, wherein the edge of the sealing film extends out of the cavity of the main body part of the mould, rounds the flange part, and is adhered on the peripheral face of the edge of the main body part of the mould with sealing adhesive tape, on the part fixedly provided the flange part, then, a hermetical space is formed between the main body part of the mould and the sealing film, the product framework and the flange part of the mould are encapsulated in the hermetical space, and the clearance between the mating faces of the main body part and the flange part is not communicated with the atmosphere; fourth, processing a suction port and a pouring port, which are respectively connected with a vacuum pump and a pouring device, on the sealing film; fifth, vaccumizing and pouring resin; and sixth, demoulding.