The invention provides an internal core-pulling slider mechanism and an injection mold thereof. The slider mechanism comprises a pull rod screw, a pull rod spring, a pressing block, a slider spring, a slider pull rod screw and a slider body; a T-type groove is designed in the slider body and used for guiding the slider body in a sliding mode, a slope is designed on the slider body and used for locking and positioning, and the double-slope design is adopted in the lower end of the pressing block. By the adoption of the mechanism and the mold provided by the technical scheme, when a product needs core-pulling at the inner side of a front mold, mold structure complexity and mold machining difficulty caused by the design of a front mold angle ejection mechanism are overcome, core-pulling at the inner side of the front mold of the product can be achieved, and the demolding quality of the product is effectively ensured; the design difficulty of the mold can be effectively reduced, the producing and manufacturing cost of the mold and the injection molding cost of the product are reduced, and the mechanism and the mold are reasonable in structural design, compact in structure, stable in work, safe and reliable.