The utility model provides a wall body building template turnover through-wall bolt which comprises an intermediate threaded rod, an outer blocking piece and a clamp nut, and a water stop plate is arranged in the middle of the intermediate threaded rod; two ends of the intermediate bolt are respectively connected with a connecting threaded rod and an end socket threaded rod in sequence in a threaded mode, the outer blocking piece is arranged on the end socket threaded rod in a sleeved mode, and the clamp nut is matched with the end socket threaded rod and is located on the outer side of the outer blocking piece; a template inner blocking piece is arranged on an end portion, connected with the intermediate threaded rod, of the connecting threaded rod in a sleeved mode, and an end socket is provided with a blocking edge; and an edge extending toward the outer side is arranged on an end socket position, connected with the connecting threaded rod, on the end socket threaded rod. By means of the wall body building template turnover through-wall bolt, the operation is simple, clamping is stable and solid, the end socket threaded rod, the clamp nut, the outer blocking piece, the connecting threaded rod and the template inner blocking piece can be respectively dismantled after the through-wall bolt is used, and each part after being dismantled can be used repeatedly; and a removing part, which is retained on the outer side of a wall body, of the intermediate threaded rod is quite short, so that a great amount of metal materials are saved, the whole structure is simple, and the through-wall bolt is flexible and reliable.