Fluid supply device for grinding and polishing machine

A fluid supply device for a grinding and polishing machine belongs to grinding and polishing liquid supply field and particularly relates to the grinding liquid and polishing liquid supply of the grinding machine. The fluid supply device for the grinding and polishing machine comprises a graduated disc (1), a constant pressure cylinder supporting stand (2), a constant pressure cylinder (3), a locking screw nut (4), a grinding liquid barrel (5), a sludge pump (6), a filter (7) and a water outlet conduit (9), wherein the grinding slurry liquid is conveyed by the sludge pump (6), thereby the pumping quality can be effectively enhanced, the abrasion of the pump is reduced; the adjustable constant pressure cylinder (3) is designed to control the flow speed of the grinding liquid, thereby realizing valveless design; the self stirring of the grinding slurry liquid is realized through the design of a special connecting port.