The invention discloses a steel tube conveying device for steel-structure scaffold set-up. The steel tube conveying device comprises a base, wherein a plurality of guide shafts are arranged inside thebase; a movable base is arranged in the base; the movable base sleeves the peripheral surface of the guide shaft; a hydraulic cylinder is arranged on the top surface of the base; a piston rod is arranged on the front part of the hydraulic cylinder; the end part of the piston rod is connected with the side part of the movable base; a supporting frame is arranged on the movable base; a supporting table is arranged on the movable base; a fixed plate is arranged on the top of the supporting table; a drive motor is arranged on the fixed plate; the front part of the drive motor is equipped with a drive shaft; a rotary roller sleeves the peripheral surface of the drive shaft; the rotary roller is arranged on the upper part of the supporting frame; a take-up and pay-off line is wound on the rotary roller; and a sleeve is arranged at the lower end of the take-up and pay-off line. According to the steel tube conveying device disclosed by the invention, the piston rod can conveniently perform reciprocating motion control on the movable base, the movable base realizes horizontal sliding regulation along the guide shaft, vertical lifting carrying can be performed on a steel tube, and a scaffold is conveniently set up; and carrying operating efficiency of the steel tube is higher.