A material cutting and grinding device is provided. The material cutting and grinding device includes a shaft, a rotor assembly, a cutting grinding sheet, a fixture and a channel set. The rotor assembly includes a housing, a rotor, an air intake opening, blades and accommodating grooves. The rotor is accommodated in a holding groove of the housing. The rotor is sleeved on the shaft. The accommodating grooves are passed through the rotor. The blades are passed through the accommodating grooves. The cutting grinding sheet is connected to the other end of the shaft. The fixture clamps the cutting grinding sheet. The channel set includes a shaft channel and a gas channel. The shaft channel is passing through the shaft. The gas channel is disposed on the fixture. The gas channel is connected to the shaft channel.