The invention discloses a dust removal system used for false tooth machining. The dust removal system comprises a machine shell, a water supply box, a water supply pump, a water return pump and an air compressor; the water supply box, the water supply pump, the water return pump and the air compressor are all installed in the machine shell, a floor drain is arranged at the bottom of the machine shell, and a filtering net is installed on the floor drain; a water inlet pipe opening of the water return pump is located below the filtering net, a water outlet pipe of the water return pump is communicated with the water supply box, a water inlet pipe of the water supply pump is communicated with the water supply box, and a water outlet pipe of the water supply pump is communicated with a gas-liquid supply pipe; a water supply valve is arranged on the water outlet pipe, the air compressor is communicated with the gas-liquid supply pipe through a gas pipe, and an air supply valve is arranged on the gas pipe; and the gas-liquid feeding pipe is connected with a water spraying pipe, and the water spraying pipe is located above a false tooth cake material. The dust removal system has the beneficial effects of being simple in structure, convenient to use and capable of achieving air cooling and water cooling functions.