The invention relates to a composite structure with the function of a sliding block of an injection equipment mold, in particular to a composite multi-function slider mechanism, which is provided with a flash mechanism and a flash ejection mechanism in the sliding block and has both the flash function and the flash ejection function in gas-assisted molding, simultaneously, the core-pulling and demoulding function of the sliding block. The slider mechanism comprises a mold body, a core plate and a sliding block body, on which the flash mechanism and the flash ejection mechanism are arranged; the flash mechanism comprises a flash valve and a hydraulic drive mechanism, the flash valve is installed in the sliding block body and the hydraulic drive mechanism is fixed on the core plate of the mold body; the auxiliary ejection rod in the flash ejection mechanism is arranged in the main ejection system of the mold. The composite structure solves the problem that different flash position points can be arranged in the flash procedure of gas-assisted molding, expands the freedom degree of product design, increases the utilization rate and functions of the mold structure and also solves the anisotropic flash problem.