Automatic cleaning device for powder coating mixing drum

The utility model provides an automatic cleaning device for a powder coating mixing drum, which is characterized in that the mixing drum is of a volume structure with an upper opening and an upper caliber larger than a lower caliber, a discharge port is arranged at the bottom of the mixing drum, and the mixing drum is cleaned and dedusted in the automatic cleaning device. The automatic drum cleaning device comprises a rotating brush, a driving motor, a lifting arm, a vertical guide rod, a lifting device and a base, the rotating brush comprises a framework arranged corresponding to the inner diameter section of the mixing drum and a brush fixed to the edge of the outer side of the framework, and the brush face of the brush makes contact with the surface of the interior of the mixing drum; the rotating brush is driven by the driving motor to form a circumferential brushing path and covers the inner surface of the mixing drum, the rotating brush is fixed to the lifting arm, the horizontal height of the rotating