Tray cushion of wheeled jack

The utility model provides a tray cushion of a wheeled jack. The main body of the tray cushion is a disc made of rubber or plastic; a plurality of circular ring-shaped or semi-circular ring-shaped grooves are formed in the upper surface of the main body; a circular ring-shaped groove matched with the rim of a tray is formed in the bottom surface of the main body; a plurality of arc-shaped lugs are arranged in the groove; the lugs have the same length as gaps among flanges on the edge of the tray; the thickness of the lugs is identical to the height of the flanges on the edge of the tray. As the lugs capable of filling the gaps among the flanges on the edge of the tray are arranged in the groove in the bottom surface of the tray cushion, the tray cushion and the steel tray cannot rotate and shift, and the tray cushion can receive even stress during operation, which is very favorable for preventing the tray cushion from being broken by uneven stress and prolonging the service life of the tray cushion.