The invention relates to a method for separating cyclohexane from acetic acid. The method comprises the following steps: heating and azeotroping a mixed solution of cyclohexane and acetic acid; addingwater to an azeotropic system of the cyclohexane and the acetic acid, and controlling a temperature of the system to be 69.4-69.6 DEG C; forming a cyclohexane-water azeotrope and separating from theacetic acid; and collecting and cooling the cyclohexane-water azeotrope, and separating to obtain the cyclohexane. The invention also discloses a system for separating cyclohexane from acetic acid. Inthe invention, the separation of cyclohexane from acetic acid is completed in a rectification column by adopting water as an entrainer, a water phase at the top of the column returns to the rectification column for cyclic azeotroping with the cyclohexane to reduce or eliminate the azeotroping of the cyclohexane with the acetic acid, cyclohexane having an acetic acid content of 1-100 ppm is obtained at the top of the column, and acetic acid having a mass concentration of more than 99.5% is obtained at the bottom of the column. The method and the system disclosed by the invention is simple in process and low in energy and material consumption.