The invention relates to a steel pipe straightener. The problems that an existing steel pipe straightener cannot achieve automatic straightening and is low in efficiency and poor in straightening effect are mainly solved. According to the technical scheme, the steel pipe straightener is adopted and comprises a support; a conveying device, a discharging device, a first straightening device arranged at one end of the conveying device in the steel pipe conveying direction and a second straightening device connected with the first straightening device end to end are arranged on the support; the conveying device comprises a first motor and transmission rolling wheels; and the first straightening device comprises a locking block, upper rolling wheels, lower rolling wheels, a lifting adjusting mechanism, a quick press overload protection cylinder and a locking air cylinder. Therefore, the problems are solved well, and the steel pipe straightener can be easily used for industrial application.