A shaping die of a plastic worm includes a movable mold part and a fixed mold part; a fixed mold die cavity arranged in the fixed mold die cavity plate; a worm die cavity in the center of a worm die cavity plate and the step shape contact surfaces mutually matched on a movable mold die cavity arranged in a movable mold die cavity plate are closely sheathed and connected up and down in sequence; the head part of a small shaping insert below the movable mold die cavity is arranged below a worm cavity body in the worm die cavity; the bottom part of the small shaping insert closely abuts against amovable mold insert in an axial rotating drive mechanism driven by a chain wheel; a knock screw arranged in the center of the fixed mold part is matched with a knock screw gear in the axial rotatingdrive mechanism by screw thread; the invention solves the technical problem of hard demoulding for manufacturing plastic worms for a long period by adopting the axial rotating drive mechanism driven by the chain wheel and synchronously carrying out separating a template by the axial moving of the knock worm and automatically falling off of a product from the worm die cavity by rotating. The product manufactured by the die of the invention has excellent mechanical property, high manufacture efficiency and good product precision, which changes the situation that the plastic worm depends on import for a long period.