The utility model relates to a big polar plate metal brush wheel of zinc electrode, said big polar plate metal brush wheel of zinc electrode mainly includes metal brush wheel, wedge belt pulley, bearing, and wherein, the metal brush wheel comprises main shaft and brush silk, and every metallic brush takes turns to installs 2 bearings, the wedge belt pulley by wedge band pulley, taper sleeve, tightly decide the bolt and form, the material of main shaft is 304 stainless steels, has characteristics corrosion-resistant, the sexual valence relative altitude, the brush wheel axle adopts a hollow shaft structure with brush silk coupling part, makes the weight of metal brush wheel can control at 48-51kg, compares weight loss 15%-20% with ordinary with the specification brush wheel, and lighten driving motor and pushed up the load of tight mechanism, because the diameter of brush silk be 0.1-0.15mm, destruction that the very meeting of compliance of brush thread led to the fact polar plate surface oxide layer. The utility model has the advantages of it is long to scrub clean, protection polar plate surface oxide layer, light in weight, simple to operate, life cycle.