The invention discloses a through-wall safety belt suspension device, which includes a preformed hole formed in the wall body, wherein a mounting rod penetrates through the preformed hole; the side wall inside the wall, of the mounting rod, is provided with a first thread; the mounting rod is sleeved with a butting plate; the butting plate is in threaded connection with the first thread; the sidewall positioned outside the wall, of the mounting rod, is provided with a second thread; the mounting rod is sleeved with a limiting plate; the limiting plate is in threaded connection with the secondthread; a passage is arranged inside the mounting rod in a penetrating manner; a connecting rope is arranged inside the passage in a penetrating manner; a first hanging ring is tied with the tail endof the connecting rope; the end, positioned inside the wall, of the mounting rod, is fixedly connected with a fixing plate; a mounting cavity is arranged inside the fixing plate; a driving mechanismis arranged inside the mounting cavity; a fixing rod is fixed on the side wall of the fixing plate. The through-wall safety belt suspension device is reasonable in structure, can provide safety belt suspension points to outer wall constructors, and is high in safety performance and safety performance.