A method for manufacturing an integrally molded and firmly bonded substrate, without coming off, for container having 3D colored dazzling effect and produced by in-mold injection molding, wherein said method comprises the following steps of:
- (A) conducting aluminum electroplating operation on a film so as to form a reflective film thereon;
- (B) combining and molding said reflective film with a base material in liquid state having a temperature as high as 250° C.˜300° C., so that high adhesion of said base material generated at high temperature of 250° C.˜300° C. is employed for firmly bonding with said reflective film together;
- (C) conducting sheet-material processing operations on said substrate integrally formed by said reflective film and said base material so as to accomplish the manufacturing of said substrate having 3D colored dazzling effect patterns thereon.