Height-adjustable steel structure stair

The utility model relates to the technical field of steel structures, in particular to a height-adjustable steel structure stair which comprises a wall surface and the ground, and a second mounting block is mounted on the inner wall of the wall surface. Through mutual cooperation of the first mounting block, the second mounting block, the motor, the threaded rod, the telescopic sleeve rod, the telescopic sleeve, the hydraulic rod, the second cushion block and the first cushion block, when the height of the stair body is not enough, the motor is started to drive the threaded rod to rotate, and the threaded rod rotates to drive the threaded sleeve to move up and down; the threaded sleeve moves up and down to drive the stair body to move up and down so that the telescopic sleeve rod can be pulled out and retracted from the telescopic sleeve, when the stair body rises, the hydraulic rod is started to drive the second cushion block to rise, and when the stair body descends, the first cushion block can be installed