Variable slope type stair

The invention discloses a variable slope type stair. The stair comprises a stair device, a supporting device, a power device and a variable device. The supporting device comprises a left side plate and a right side plate, a motor fixing plate is fixedly mounted on the inclined surface parts of the left side plate and right side plate, a motor is fixedly mounted on the motor fixing plate, and an output shaft of the motor is connected with a gear; a sliding plate is provided with teeth which can be meshed with the gear, and a control box is fixedly mounted on a placing plate; the motor drives the sliding plate to move so as to drive an independent stair body formed by a stair baffle and a stair surface to rotate in order to complete a deformation process. The stair has the advantages that astair structure can be selectively changed according to demands through reverse thinking, the normal functions of the stair are maintained, and the problems that robots, people in wheelchairs and thelike have difficulty in cl