Steel bar rust removal device

The utility model discloses a steel bar rust removal device which comprises an outer hollow sleeve barrel arranged on a rotary body and an inner lining hollow barrel, wherein the outer hollow sleeve barrel has two sections of sleeve barrels with variable inner diameters and variable outer diameters; the inner lining hollow barrel is sheathed in the wide inner diameter section of the outer hollow sleeve barrel, and a small through hole group is arranged on the barrel wall of the inner lining hollow barrel. Steel wires penetrate through small holes of the small through hole group. When a steel rod (a steel reinforcement) enters, the steel wires on the barrel wall of the inner lining hollow barrel can remove rust for the steel rod (the steel reinforcement) along with the synchronous rotation of the outer hollow sleeve barrel on a rotary body and the inner lining hollow barrel. The utility model is good for increasing the thread machining quality and prolonging the lifespan of a roller and a cutter.