Multi-stage purification device for high-purity argon

The invention relates to a multi-stage purification device for high-purity argon, and belongs to the technical field of argon extraction equipment, the multi-stage purification device comprises a bottom box and a cylinder arranged on the bottom box, a U-shaped pipe is communicated with the bottom box and the cylinder, the side, located in the cylinder, of the U-shaped pipe is a first pipe body, and the side, communicated with the bottom box, of the U-shaped pipe is a second pipe body; the first pipe body is communicated with the second pipe body, a plug is arranged at the end part of the first pipe body in a sliding manner, the sliding direction of the plug is parallel to the axis direction of the first pipe body, and the plug is clamped into the first pipe body in a sliding manner under the driving of a reflux solution; purified argon is conveyed into the first pipe body, and the plug is driven to move out of the first pipe body. According to the invention, the possibility of backflow of the fuchsin solution