The utility model discloses a fixed-distance safety device of a molding machine tool. The fixed-distance safety device of the molding machine tool is placed between two movable mould plates of the machine tool and comprises a rod body, wherein one end of the rod body extends inwards and is provided with a hole-shaped cavity; a spring is arranged in the cavity; a sliding rod is arranged at the top end of the spring; the top end of the sliding rod extends out of the cavity; an acquisition hole which is communicated with the cavity is formed in the outer wall of the rod body; a signal acquisition device for acquiring movement signals of the sliding rod is arranged in the acquisition hole; the signal acquisition device is connected with an electric control device of the machine tool. By the fixed-distance safety device of the molding machine tool, the safety protection effect in the manufacturing industry of material molding and the like is obvious, and equipment damage and personal injury are greatly reduced. By the fixed-distance safety device for the molding machine tool, the safety of operators is ensured and the material molding machine tool is properly protected from being damaged when a plurality of materials are molded; moreover, the fixed-distance safety device for the molding machine tool is simple in structure and is used quickly, conveniently, and reliably.