Grinding liquid recovery device of polishing machine

The utility model provides a grinding liquid recovery device of a polishing machine, which comprises a first tank and a second tank, and the bottom of the first tank is vertically connected with the top of the second tank through a first pipeline; wherein the bottom of the second tank is provided with a liquid outlet, and the liquid outlet is connected with a liquid collecting barrel through a second pipeline; an air inlet is formed in the 1/3 position of the lower end of the first tank and connected with workshop equipment, and an exhaust port is formed in the top of the first tank and connected with a vacuum pump. Wherein the height difference between the air inlet and the air outlet is 1.2 m. The volume ratio of the first tank to the second tank is 2.5: 1-3: 1. And the ratio of the diameter of the first pipeline to the diameter of the liquid outlet is 1.5. The ratio of the diameter of the air inlet to the diameter of the first pipeline is 1.5. The diameter of the air inlet is the same as that of the exhaus