The utility model discloses a dynamic visualized simulation device for crude oil electric dehydration, relates to the technical field of high voltage and insulation, and solves the problem that the difference between the experimental data obtained by the existing laboratory crude oil electric dehydration device and data adopted in practical production is pretty large. The device comprises a high-voltage power supply, a mold temperature machine, an emulsifying shearing mixing tank, a crude oil metering pump, a crude oil flow controller, a high-voltage electric dehydrator, a waste liquid tank and a circulating pump. In a working process, the dehydrated crude oil is homogeneously heated in the emulsifying shearing mixing tank, the crude oil flow injected into the high-voltage electric dehydrator is controlled by regulating the flow controller, so that the crude oil is subjected to oil-water separation in the electric field part formed by electrodes inside the high-voltage electric dehydrator, and the formation conditions of an oil-water interfacial layer and a water phase layer in a dehydration process are observed through a visual window. By adopting the simulation device disclosed by the utility model, crude oil dehydration parameters can be accurately controlled, dehydration principle can be analyzed and optimal dehydration parameters can be summed up, so that the device has very important guiding significance in the selection of the high voltage power supply parameters and the distance between polar plates inside the electric dehydrator.