Sealing device for lifting liquid tank of electrical processing machine tool

A sealing device for a lifting liquid tank of an electric processing machine tool comprises a workbench and a fixed liquid tank. The workbench is in a rectangular plate shape, the periphery of the workbench is sleeved with a square-barrel-shaped lifting liquid groove, and the lifting liquid groove is connected with a lifting mechanism so that the lifting liquid groove can move up and down. An annular gap is formed between the periphery of the workbench and the inner wall of the lifting liquid tank, an oil-resistant elastic sealing ring is arranged in the annular gap, an annular upper pressing plate is arranged at the top of the sealing ring, and an annular lower top plate is arranged at the bottom of the sealing ring; the inner wall of the upper pressing plate is fixedly connected with the workbench; a plurality of air cylinder supports are arranged at the bottom of the workbench, each air cylinder support is provided with an air cylinder, and the top of a piston rod of each air cylinder is fixedly connected