The invention discloses a tower-type PCB and a stitching method thereof, which relate to the field of printed circuit boards. The tower-type PCB comprises a PCB body, the PCB body comprises an upper layer board and a lower layer board, and the PCB body also comprises square needles; the PCB body is provided with a plurality of welding stitching holes and fixing stitching holes, square needles can be inserted into the welding stitching holes and the fixing stitching holes for stitching, and the welding stitching holes and the fixing stitching holes are used for fixing an upper layer board and a lower layer board. The welding stitching hole and the fixing stitching hole are both in clearance fit with the square needle, the diagonal length of the cross section of the square needle is larger than the aperture of the welding stitching hole and the aperture of the fixing stitching hole, and the aperture of the fixing stitching hole is smaller than that of the welding stitching hole. By the adoption of the scheme, effective stitching of the PCBs can be guaranteed, the bad conditions of deformation, dislocation and the like of the upper PCB and the lower PCB are avoided, meanwhile, soldering tin can permeate to the other sides of the PCBs from the stitching holes, and it is guaranteed that welding on the other sides is free of the bad phenomena of solder skips, pseudo soldering, surfacing and the like.