Large-diameter pipe traction device

The utility model discloses a large-diameter pipe traction device, and belongs to the technical field of plastic pipe production. Comprising a traction pipe assembly and a traction auxiliary device, the traction pipe assembly comprises a sizing part and a reducing part which are connected, the end of the sizing part is used for being connected with a pipe, the reducing part is used for entering a cooling box, and the reducing part is formed by sequentially connecting traction pipes with the pipe diameters gradually reduced; a hole is formed in the joint of the traction tube of the reducing part; the traction auxiliary device comprises a supporting track and a cantilever hoisting device; the cantilever hoisting device is in sliding connection with the supporting track; a hoisting arm of the cantilever hoisting device is connected with a hoisting plate; the lifting plate is used for extending into the open hole to lift the joint of the traction pipe of the reducing part through the cantilever lifting device; ac