Prefabricated parts of large pipe and box and planar precise butting method thereof

The invention belongs to the technical field of butting of prefabricated parts of large pipes and boxes, and particularly relates to the prefabricated parts of the large pipes and boxes and a planar precise butting method thereof. Traction mechanisms are symmetrically distributed on opposite axes on the inner diameter side walls of the prefabricated parts, the traction mechanisms comprise inserting and connecting seats which are fixedly connected with the inner walls of the pipes and the inner walls of the boxes, inserting pieces connected with the inserting and connecting seats in an inserted mode and pulling cables arranged in the end portions of the inserting pieces in a penetrating mode, and at least one inserting and connecting seat is arranged at the middle point of the length of the pipes and the boxes. According to the prefabricated parts, the operation of two chain blocks in the pipes and the boxes is carried out through one person so that errors and interference generated by multi-person control can