The invention belongs to the technical field of surface electroplating, and particularly relates to an electroplating brush device. The electroplating brush device comprises a brush application tank,a workpiece fixing device, a brush application device, a drive device, a brush application liquid conveying device and an infrared distance measuring sensor. A controller is used for automatically controlling the workpiece fixing device, the brush application device, the drive device, the brush application liquid conveying device and the infrared distance measuring sensor. A cam is arranged in a center hole of a friction wheel, an extrusion plate is arranged in a sliding groove of the friction wheel in a sliding manner, two air bags are symmetrically arranged on the left side and the right side below the friction wheel, the lower ends of the air bags are connected with second one-way valves, the second one-way valves communicate with water spraying discs, the water spraying discs are fixedly connected to the middle portions of hair bundles, electroplating liquid is evenly sprayed to the upper ends of the hair bundles, and accordingly the uniformity of a workpiece surface clad layer isguaranteed; and when the friction wheel drives the extrusion plate to the upper half part of the cam, the extrusion plate contracts into the friction wheel under the action of elasticity of springs, and accordingly contact between the friction wheel and the workpiece surface cannot be influenced.