The invention relates to a small derusting machine. The small derusting machine comprises a hand-held machine body, and a telescopic impacting pin bundle is arranged at the front end of the hand-held machine body; the tail end of the hand-held machine body is connected with an air compressor through an air pipe; and a pneumatic switch is arranged on the hand-held machine body. According to the small derusting machine, structure is simple, operation is convenient, carrying is convenient, the derusting effect is good, labor intensity of workers is reduced, working efficiency is improved, and practicability is high.