Built-in pre-resetting mold

The utility model provides a built-in pre-reset die which comprises a lower fixing plate, square irons are fixed on the upper portions of the two ends of the lower fixing plate, a lower die plate is fixed at the upper ends of the two square irons, a lower die core is arranged on the upper end face of the lower die plate in an embedded mode, and an upper die plate is arranged at the upper end of the lower die plate. An upper mold core is embedded in the lower end face of the upper mold plate, a guide seat is further arranged at the upper end of the lower mold core, a sliding block in sliding connection is arranged in the guide seat, a top plate in movable connection is arranged between the two pieces of square iron, and a top rod is vertically fixed to the upper end of the top plate. And the ejector rod is reset firstly, in the reset process, the sliding block is away from the cavity, interference between the sliding block and the ejector rod due to sliding of the sliding block is avoided, after the ejector ro