Screw type platform ladder

The utility model discloses a screw type platform ladder which comprises a guide rail, a platform assembly, a driving assembly and a shaft assembly, the driving assembly comprises a screw, a driving nut and a driving motor, the vertically arranged screw is sleeved with the driving nut through threads, and the driving motor drives the driving nut to rotate through a transmission assembly. The lower end of the screw rod is arranged on the pit motor through a screw rod fixing round pipe, the pit motor is fixedly arranged on a shaft bottom frame assembly of the shaft assembly, a bearing capable of bearing axial force is arranged at the upper end of the screw rod, and the bearing is arranged on the screw rod through a fixing assembly. The auxiliary motor is arranged at the lower end of the screw rod, and when power is cut off, the auxiliary motor automatically works to drive the platform ladder to move downwards or upwards to a nearby floor, so that passengers can get out of trouble conveniently. 本实用新型公开了一种螺杆式平台梯，