Mounting method of hoistway type dual-purpose conversion ladder

An installation method of a hoistway type dual-purpose conversion ladder is characterized by comprising the following steps that A, a hoistway and a rail for limiting a counter weight to move up and down are provided, the rail is fixedly connected to one side wall of the hoistway through a wall supporting structure, and the counter weight is connected into the rail to move; b, a dual-purpose conversion compartment and compartment guide rails are provided, and the dual-purpose conversion compartment is installed on the compartment guide rails and vertically arranged in the hoistway; and C, a large cross beam, a traction type driving motor, a buffering transmission wheel set, a lifting rope set and a traction rope set are provided and installed, the traction type driving motor is installed on a motor base to be fixed, then the lifting rope set is connected with a balance weight, and the traction rope set is connected with the dual-purpose conversion box, so that the dual-purpose conversion box moves in the hois