The invention relates to the technical field of coating processing, in particular to a filtering device for coating processing. The filtering device comprises a processing table, a feeding device, a conical cylinder, a stirring device, a first filtering device, a crushing device and a second filtering device, the processing table is arranged on a horizontal plane, the feeding device is vertically arranged on the processing table, and the stirring device is arranged on the conical cylinder; the conical clamp is clamp on the processing table and located beside the feeding device, the stirring device is installed on the conical barrel, the first filtering device is arranged in the conical barrel and installed at the bottom of the stirring device, the crushing device is arranged in the first filtering device, the second filtering device is arranged in the second filtering device, and the second filtering device is arranged under the crushing device and is mounted on the conical cylinder. According to the powder coating filtering device, through mutual cooperation operation of all the devices, automatic feeding is achieved, secondary filtering can be conducted on powder coatings, the filtering effect of the powder coatings is better, the quality of the filtered powder coatings can be improved, and therefore the processing efficiency of the powder coatings is improved.