The invention relates to a steel pipe bending machine. The steel pipe bending machine comprises a bottom plate, a fixing device and a bending device, wherein the bottom plate is provided with the fixing device and the bending device, and the fixing device is located in front of the bending device. The fixing device comprises a fixing frame, a fixing cylinder, a fixing wedge-shaped column, a fixingcompression ring, a fixing inner sleeve and a fixing outer sleeve. The bending device comprises a bending platform, a bending moving mechanism and a filling mechanism. The bending platform and the bending moving mechanism are mounted on the bottom plate. The problems that the bending effect of existing manual bending of a steel pipe by means of tools is not ideal, when the pipe is thicker, the steel pipe is difficult to bend by artificial power and the bending position is prone to being flat inwards; an existing bending radian of the steel pipe is relatively fixed generally, the bending radian of the steel pipe needs to be changed by manually changing a machine, the operation time is prolonged by manually changing the machine, and the work efficiency is reduced are solved.