The invention provides a steel pipe rust removing device for construction and belongs to the technical field of construction equipment. The steel pipe rust removing device comprises a bottom plate, avertical plate, a fixed plate, a mounting plate and a top plate and is characterized in that the vertical plate is fixedly connected to the left top of the bottom plate, and the fixed plate is fixedlyconnected to the right top of the bottom plate; the top plate is fixedly connected to the right of the top end of the vertical plate, and a left hydraulic cylinder and a drive motor are welded to thelower portion of the right side of the vertical plate; the left hydraulic cylinder is located above the drive motor, and a left telescoping rod is movably connected to the right end of the left hydraulic cylinder. The steel pipe rust removing device has the advantages that during rust removing, a steel pipe is placed on hooks, the left hydraulic cylinder and a right hydraulic cylinder controls afirst driven gear and a second driven gear through the left telescoping rod and a right telescoping rod to squeeze and clamp the steel pipe by the aid of clamping blocks, the drive motor controls a rotary shaft to rotate at the same time, a first drive gear and a second drive gear on the rotary shaft drive the first driven gear and the second driven gear to allow the steel pipe to rotate, and rustremoving is performed on the steel pipe through a rust removing plate below the mounting plate.