The invention relates to the technical field of characteristic industrial oil treatment, in particular to a special industrial oil life-prolonging filtering and washing replacement device which is characterized in that a floating heating device is installed in a
storage tank in a floating mode, and a circulating oil spraying device is arranged on the outer side of the floating heating device and fixedly connected with the top of the
storage tank; the floating heating device comprises a floating plate, a spiral
metal pipe, a heating core, a hollow
pipe and a wire, a side block is fixedly installed at the edge position of the floating plate, the circulating oil spraying device is fixedly installed at the position of the side block, and the circulating oil spraying device comprises an
insertion pipe, a circulating U-shaped bent pipe, a
circulating pump, a spraying ring body, a flexible
metal pipe and a balance weight oil suction ball. The floating heating device transfers heat into oil liquid, the interior of the oil liquid is heated, the oil liquid can be heated from the side face and the interior of the oil liquid at the same time, the temperature rising speed of the oil liquid is increased, the oil-water separation speed is increased, the oil liquid is made to be in a spraying state, the contact face of the oil liquid and air is increased through the oil liquid spraying state, water in the oil liquid is dissipated quickly, and the oil liquid is heated. The oil-water separation speed is accelerated.