The invention relates to a box for exhausting fog generated by a chocolate spray gun. The box comprises a box body, wherein a working rotary table is arranged at the bottom of the box body, and a dust-proof box cover is arranged at the upper part of the working rotary table; smoke exhaust holes are formed in one side of the box body, the box body communicates with a fan room through the smoke exhaust holes, and a fan is arranged on the upper side of the fan room; a partition board is arranged on the lower end surface of the fan, and a dust collecting box is arranged under the partition board. According to the box for exhausting fog generated by the chocolate spray gun, the fog can be timely exhausted, and besides, the fan is convenient to disassemble and assemble, convenient to use and high-efficient.