A fiber resin composite member manufacturing method includes the steps of: selectively distinguishing waste rubber and synthetic resins containing waste tires and waste PET bottles, waste fibers, waste timbers, waste paper, waste plant straws, waste shells from shellfish or clams and so on from industrial waste materials in accordance with their physical chemical features; disintegrating the waste rubber and synthetic resins containing the waste tires and the waste PET bottles in a super low temperature cooling method, disintegrating the waste fibers in an appropriate size by using a scutcher, and distintegrating the other waste materials by means of a general crusher; pouring the disintegrated waste materials into a molding machine in a predetermined composition ratio and melting-molding them in a desired type at a high temperature of about 150 to 300.degree. C. and a high pressure of about 150 to 3,000 ton; and cooling the molded fiber resin composite member at a temperature of about 40 to 70.degree. C. and pressure under about 500 to 800 ton to manufacture a complete product.