The invention discloses an elevator pit ladder stand device. A mounting device comprises a first mounting seat and a locking structure, wherein the first mounting seat is provided with a mounting shaft; the locking structure is arranged on the first mounting seat; the locking structure comprises a cantilever, a first limiting part and a second limiting part, wherein the first limiting part and thesecond limiting part are arranged in a staggered manner; the first limiting part or the second limiting part is arranged nearby a pit wall of a pit; one end of the cantilever movably sleeves the mounting shaft and the cantilever can rotate relative to the mounting shaft; when the cantilever moves to a pre-set position, the cantilever can rotate relative to the mounting shaft, so that the connection of the cantilever can be switched between the first limiting part and the second limiting part; a ladder stand assembly is connected with the other end of the cantilever; when the cantilever is connected with the first limiting part arranged nearby the pit wall of the pit, the ladder stand assembly can be arranged at the inner side of a sill; when the cantilever is connected with the second limiting part, the ladder stand assembly can be arranged at the outer side of the sill.