The utility model discloses a supporting steel pier arranged at a pit of an elevator. The steel pier comprises a base, a downwards-concaved installing groove is formed in the upper surface of the base, and the steel pier further comprises a telescopic part installed inside the installing groove. The telescopic part slides vertically along the installing groove, multiple first limiting holes are formed in the side wall of the base, and second limiting holes matched with the first limiting holes are formed in the side wall of the telescopic part. The steel pier further comprises a fixing shaft, and when the first limiting holes are aligned with the second limiting holes, the fixing shaft is inserted into the first limiting holes and the second limiting holes so as to fix the telescopic part to a certain height.