The invention belongs to the technical field of processing of a varnished wire, specifically a varnished wire covering film thickness adjustment system. The varnished wire covering film thickness adjustment system comprises a shell, an ash removing module, a wire material, a painting module, a layer uniformizing module and a driving module; the ash removing module is arranged at one end of the interior of the shell, and the ash removing module is used for removing dirt from the surface of the wire material; the painting module is arranged in the middle part of the interior of the shell and thepainting module is used for covering the surface of the wire material with an insulating paint film; the layer uniformizing module is mounted at the other end of the interior of the shell and the layer uniformizing module is used for uniformizing the paint layer thickness; the driving module is mounted on the bottom surface of the shell; the driving module is used for driving the layer uniformizing module to rotate; and the wire material passes through the ash removing module, the painting module and the layer uniformizing module to complete painting. By virtue of setting of the painting module, the surface of the wire material can be painted in a rotary rolling manner, so that painting uniformity can be improved; and by virtue of matched setting of the layer uniformizing module, furtheruniformizing of the coated film on the surface of the wire material can be realized, so that film coating uniformity can be improved and the wire material insulating quality is improved.