The invention discloses an automatic brush plate machine of a zinc electrolysis cathode plate, comprising an intaking-plate distance-arranging device (1) and a chain transmission device (2) which are sequentially arranged, a roller brush-plate device (3) and an unloading plate release device (4) which are sequentially arranged along a transmission chain (2d) of the chain transmission device (2), wherein, the roller brush-plate device (3) is located above the chain transmission device (2). The invention can continuously clean a plurality of cathode plates, and has advantages of simple operation, high brush-plate efficiency, and reliable working.