Compression device for krypton gas purification

The compression device comprises a sealing tank, a first compression plate, a first piston, an air inlet pipe, a first pipe valve, a communicating pipe, a one-way valve, an exhaust pipe and a second pipe valve, the first compression plate is located in the sealing tank and connected with a driving assembly for driving the first compression plate to ascend and descend, and the bottom face of the first compression plate is fixedly connected with the first piston; the center of the first compression plate is fixedly connected with a communicating pipe, the communicating pipe penetrates through the first compression plate and the first piston, a one-way valve is arranged on the communicating pipe, and the air inlet pipe is communicated with the portion, close to the top, of the outer side of the sealing tank. Gas is compressed in a mode of driving the piston to descend, meanwhile, the measure that the gas passes through the piston is taken, the gas pressure can be increased after continuous compression, the compr