Stair machine is climbed to electronic year thing of telescopic star gear, including the backup pad, the preceding bottom fixed connection horizontally bearing plate of backup pad, the back fixed mounting supporting seat of backup pad, be equipped with the bearing on the supporting seat, the outer wall of bearing inner race fixed connection transmission shaft, the transmission shaft is hollow transmission shaft, the camera includes a supporting plate, be equipped with two adjusting gears in the shell respectively, be parallel to each other between the adjusting gear, the both sides of every adjusting gear cooperate respectively and are equipped with a rooted tooth strip, the one end installation gyro wheel of rack, the gyro wheel is located the outside of shell, gyro wheel evenly distributed is in the periphery of shell, the other end of rack is located the shell. The utility model discloses it is small, can not take very big space, in complete machine lightweight, convenientization, kept powerful lifting capacity. Comparing and climbing building machine in the current thing that carries, the telescopic usable stair scope of stair machine of climbing is wider, and lower to the dimensional requirement of step, the messenger climbs building machine and constructs more practically.