The invention relates to a novel oil-water separation device. The novel oil-water separation device comprises a sewage tank as well as a draining pipe, a heating plate, a monitor, an oil draining pipe, an electromagnetic valve and a temperature controller which are fixed on the sewage tank, wherein the heating plate is used for heating an floating oil layer, and the oil draining pipe is used for draining floating oil outwards; the electromagnetic valve is fixedly arranged on the oil draining pipe; the sewage pipe and an emptying pipe are arranged on the sewage tank; the monitor is fixedly arranged on the inner wall of the sewage tank and is as high as a heater, the electromagnetic valve and the temperature controller; the inlet of the draining pipe stretches into the bottom of the sewage tank, the outlet of the draining pipe is formed outside the sewage tank, and the height of the outlet of the draining pipe is not smaller than the vertical height of the oil draining pipe; an oil accumulating groove is further formed in the inner side wall of the sewage tank, is arranged above the heating plate and is connected with the oil draining pipe.