The invention relates to a tool disc cooling device of a cutting machine. The tool disc cooling device comprises an oil atomizer, and a gas conveying mechanism, wherein the oil atomizer is fixedly arranged on the head of the cutting machine; the gas conveying mechanism is fixedly arranged on the head of the cutting machine, and is used for conveying the atomized gas produced in the oil atomizer into a tool disc box; the gas conveying mechanism is respectively connected with the oil atomizer and the tool disc box. Compared with the prior art, the tool disc cooling device has the advantages that when a fabric is cut by the cutting machine, the internal oil is atomized by the oil atomizer, the atomized mist is conveyed into the tool disc box by the gas conveying mechanism to cool a cutting tool in the tool disc box, and the whole cooling process mainly adopts the oil cooling type, so that the problem of easiness in melting of fabric is completely solved when the fabric is cut by the cutting tool; because the atomized oil has a smaller molecular structure, while the cutting tool is being cooled, the atomized oil can be quickly settled into the air, and the influence to the cutting of the cutting tool is avoided.