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 roller brush-plate device (3) includes two bisymmetric switching brush wheel propulsion plants and a lifting device capable of lifting through the brush wheel propulsion plants; the brush wheel propulsion plants include symmetric at least two pairs of brush wheels (3g), each brush wheel is connected to a pushing bar of a vertical propulsion mechanism (3d) through a crank mechanism (3h), and a central axis (3i) of each brush wheel is connected to a third motor (3a) through a synchronous belt mechanism (3e). The invention can continuously clean a plurality of cathode plates, and has advantages of simple operation, high brush-plate efficiency, and reliable working.