Enhanced type composite filler and method for preparing fiber-reinforced plastic product by using same

The invention provides an enhanced composite filler capable of improving the strength, the stiffness and the dimensional stability of a fiber-reinforced plastic product and a method for preparing the fiber-reinforced plastic product by using the enhanced composite filler. The enhanced composite filler specifically consists of three kinds of modified powder, i.e. modified rod-shaped powder, modified flake-shaped powder and modified granular powder, and the modified powder comprises powder and modifiers coated on the surface of the powder, wherein the weight of the modifiers is 0.5-10% of the weight of the modified powder, and the modified rod-shaped powder accounts for 10-90 parts by weight, the modified flake-shaped powder accounts for 5-60 parts by weight, and the modified granular powder accounts for 0.5-40 parts by weight. The method provided by the invention has the advantages that: the prepared product is excellent in strength, stiffness and toughness, the raw materials are easily obtained, and the operating process is simple, so that the method is applicable for industrial scale production.