The invention relates to the technical field of chemical engineering, and discloses a chemical waste oil extraction device for refining chemical sewage. The device comprises a sewage tank, a water inlet pipe is fixedly mounted at the top end of the sewage tank, a water outlet pipe is fixedly mounted at one end, away from the sewage tank, of the water inlet pipe, a filter screen is fixedly mountedat one end, away from the water inlet pipe, of the water outlet pipe, and a water guide box is fixedly mounted on the outer wall of the water outlet pipe. According to the device for extracting the chemical waste oil in the chemical wastewater, a motor and fan blades are used in cooperation, so that when the motor works, the output shaft of the motor drives a heating block to rotate, the heating block heats oily water in an oil removal box, and industrial oil is prevented from being solidified; the fan blades are driven to rotate when the heating block rotates, and grooves are formed in the inner walls of the fan blades, so that in the rotating process of the fan blades, the grooves can increase rotation of sewage in the oil removal box, small vortexes are formed in the center of the bottom end of the oil removal box, the oil dipping contact surface of an oil dipping rod is larger, and therefore the oil removing process can be conducted more efficiently.