Screw blade stretcher capable of controlling screw pitch

The utility model discloses a screw pitch controllable helical blade stretcher which comprises a device base, a fixing support is arranged on the upper surface of the device base, a placing groove is formed in the surface of the fixing support, limiting sliding grooves are formed in the upper side and the lower side of the interior of the placing groove, threaded rods are arranged in the limiting sliding grooves, and the threaded rods are connected with the fixing support. A movable placing plate is arranged on the outer surface of the threaded rod, the movable placing plate is arranged in the placing groove and the limiting sliding groove, and a hydraulic telescopic rod is arranged on the outer surface of the movable placing plate. The screw blade stretcher capable of controlling the screw pitch is provided with the device base, the device base can be separated, a movable containing plate on the fixing support can be driven by a threaded rod to adjust the position along a containing groove and a limiting sli