The invention relates to the technical field of surface treatment for conveying wheels, in particular to a surface treatment device for the conveying wheels in a conveying device. By means of the surface treatment device for the conveying wheels in the conveying device, people can be replaced to realize surface treatment for the conveying wheels, occurrence of the situation that manual surface treatment by people under rotation of the conveying wheels is prone to cause personal injury is avoided, manpower can be further saved, and the production efficiency is improved. According to the surfacetreatment device for the conveying wheels in the conveying device, the conveying device comprises at least three rotating shafts arranged parallelly, each rotating shaft is connected with at least one conveying wheel, the surface treatment device comprises surface treatment main bodies and supporting racks, each supporting rack comprises a supporting main body and at least two supporting arms which are connected to the corresponding supporting main body and arranged to extend downwards in the opposite directions, the tail end of each supporting arm is connected with a plurality of rotating wheels, the rotating axes of the rotating wheels are parallel to the extending directions of the rotating shafts and the rotating axes of at least two rotating wheels in the multiple rotating wheels arenot misaligned, the multiple rotating wheels do not touch each other, and the surface treatment main bodies are connected to the supporting main bodies.