The invention discloses a safety climbing device for building secondary structure and limb operations. The safety climbing device comprises supports and a platform, wherein a positioning plate is arranged at the lower ends of the supports, a fixing plate is arranged at the upper ends of the supports, a movable plate is slidably connected in the fixing plate, a threaded rod is rotationally connected in the fixing plate, a first gear is arranged at the rear end of the threaded rod, a first motor is arranged above the fixing plate, a second gear is arranged at the output end of the first motor, left and right sides of the upper end face of the movable plate are provided with vertical plates, a rotating shaft is rotationally connected between the vertical plates, take-up wheels are arranged atthe left end and the right end of the rotating shaft, a steel wire rope is wound in the take-up wheels, a support plate is arranged on the right side of the vertical plates, a second motor is arranged on the support plate, the output end of the second motor is connected with the rotating shaft, fixed rods are arranged on the inner side of the supports and above the positioning plate, movable rodsare arranged in the fixed rods, the platform is arranged between the front ends of the movable rods, and the steel wire rope penetrates through a wire pass hole to be connected with the platform. Thesafety climbing device has the advantages that the position of the platform can be adjusted horizontally and vertically, and the platform is convenient and safe to use.