The invention provides a manufacturing method for glass fiber reinforced composite products. The manufacturing method for the glass fiber reinforced composite products includes the steps that a fiberglass mesh is cut; a fiberglass bundle is cut off and is evenly mixed with polypropylene in a twin screw at the temperature of 180-250 DEG C, and then the mixed melt is extruded onto a conveyor belt, wherein the mixed melt includes, by weight, 20%-50% of chopped fiberglass and 50%-80% of polypropylene; the fiberglass mesh is clamped between the two layers of mixed melt, so that a die blank is obtained; the conveyor belt conveys the die blank to the heat preserving section, and the die blank is subjected to pre-combination after being kept at the temperature of 150-200 DEG C for 1-2 min; and the die blank is clamped and placed in a die for compression molding, and then the glass fiber reinforced composite products are obtained. According to the manufacturing method, the problem that composite products are poor in impact resistance in the using process is solved, and the risk that the composite products are cracked after being impacted is reduced.