The invention discloses an energy-saving efficient scrap steel crushing device, and relates to the technical field of building template conveying, the energy-saving efficient scrap steel crushing device comprises two supporting columns, a crushing box is fixedly connected between the two supporting columns, two crushing rollers are symmetrically arranged in the crushing box, a rotating mechanism is arranged in one supporting column, and a crushing mechanism is arranged in the other supporting column; supporting plates are fixedly connected to the top ends of the two supporting columns correspondingly, a treatment box is fixedly connected between the two supporting plates, a material pushing plate is arranged in the treatment box, material pushing mechanisms are arranged in the two supporting plates correspondingly, and a top plate is fixedly connected to the top ends of the two supporting plates. According to the waste steel crushing device, the size of waste steel can be extruded and reduced, subsequent crushing operation is facilitated, a pushing mechanism can drive a pushing plate to move back and forth so as to push the extruded waste steel to a discharging opening, and a rotating mechanism can adjust two crushing rollers to rotate in the opposite directions at the same time, so that the purpose of crushing the waste steel can be achieved.