The invention discloses a water-sand mixed type sand blasting process. Sand blasting is conducted on a workpiece to be treated through water-sand mixed liquid firstly, and then the workpeice obtained after sand blasting is conducted is cleaned with clear water. A system special for the water-sand mixed type sand blasting process comprises a sand blasting gun and an electrical control system connected with the sand blasting gun. An air compressor is connected to one end of the sand blasting gun. The sand blasting gun is connected with a first solenoid valve and a second solenoid valve. The first solenoid valve is connected with a water-sand mixed pool. The second solenoid valve is connected with a clear water pool. A dust and oil stain collection pool is mounted between the water-sand mixed pool and the clear water pool. By the adoption of the scheme, oil stains and rust on the surface of the workpiece are washed away through high-speed sand particles, and meanwhile the heat generated in friction between the sand particles and the workpeice is taken away by water, so that the thin workpiece cannot deform easily, then the workpiece is cleaned with the clear water, and the dust is reduced; the dust generated in sand blasting and the oil stains on the surface of the workpeice are washed into the water-sand mixed pool through the water, flow to the dust and oil stain collection pool and then flow back to the clear water pool, and a water circulating process is formed; and more water resources are saved.