The utility model relates to a sealing device for mainshaft of washing equipment, comprising a mainshaft, a shaft sleeve, an outer shell, a V-shaped sealing ring and a reinforced seal as well as a water-tight plate arranged on the shaft sleeve, an oil-tight plate and a bearing block. An assembly step matching the shaft shoulder of the mainshaft is positioned on the shaft sleeve and a fixed gap forms between the shaft sleeve step and the water-tight plate. A step positioned relative to the outer shell is available on the bearing block. A chamber and overflow orifice are arranged between the V-shape sealing ring and reinforced seal. The sealing device for mainshaft in the utility model is based on a sealing combining single V-shape sealing ring and single reinforced seal, maintaining an amount of compression of the V-shape sealing ring via the gap between the shaft sleeve and the water-tight plate. When the bearing is assembled in place, a deterministic value is obtained for the amount of compression of the V-shaped sealing ring so that the V-shape sealing ring becomes more reliable. The utility model has advantages of very simple and easy fabrication and installation, less cost, safety and reliability by reducing a shaft sleeve and a V-shaped sealing ring, and assured amount of compression of the V-shaped sealing ring, thus improving the service life.