The utility model discloses a protective housing of a cutting machine. According to the protective housing of the cutting machine, a high speed spark produced when metal is cut by the cutting machine can be buffered, people and articles are protected, and the production safety is greatly improved. The protective housing comprises a front side opening, a protective housing body used for storing the cutting machine and a buffer layer which is arranged in the protective housing body and is used for buffering the spark produced by the cutting machine.