The invention discloses an impurity removal device for wool processing. The impurity removal device comprises a base, wherein an impurity removal box is arranged above the base, a crushing barrel is arranged on the left side of the impurity removal box, a first motor is arranged on the left side of the interior of the crushing barrel, a first rotating rod is arranged at the output end of the first motor, a rotating blade is arranged on the first rotating rod, stirring rods are arranged in the impurity removal box, a filter screen plate is arranged below the stirring rods, the filter screen plate is in sliding connection with the impurity removal box, a water tank is arranged on the left side of the impurity removal box, a water pump is arranged at the top of the water tank, a water outlet pipe is arranged at the water inlet end of the water pump, a water inlet pipe is arranged at the water outlet end of the water pump, and the tail end of the water inlet pipe is in communication with the impurity removal box. During working, wool is poured into the crushing barrel from the feeding hopper, the wool is opened through the arrangement of the rotating blades, and the phenomenon of wool caking is fully avoided; meanwhile, a water pump injects water into the impurity removal box, a second motor drives the stirring rods to rotate, and thus the wool is cleaned.