Periodic cold pilger mill

The utility model discloses a periodic cold pilger mill. The device comprises a machine body and a roller core, an extending plate is vertically arranged in the center of the upper end of the machinebody, a motor is arranged at the front end of the extending plate, a rotating shaft is arranged in the center of the lower end of the motor, the lower end of the rotating shaft vertically penetrates through the machine body, a roller is arranged outside the lower end of the rotating shaft, a wedging groove is formed in the center of the roller, and a sliding block is arranged in the lower end of the rotating shaft. According to the utility model, the hollow pipe at the front end of the new roller core is clamped in the wedging groove; after complete fitting, the extending ends of the outer sides of the sliding blocks are aligned with the limiting holes and located in the same horizontal plane; and then a user reversely rotates the fixing screw rod to enable the fixing screw rod to move upwards, the extrusion block