Gas well sand washing device

The invention provides a sand washing device for a gas well, and belongs to the technical field of oil and gas production in an oil field. The device comprises an upper joint, a lower joint, a pressure control valve group and a continuous pipe, a first cavity is formed in the upper end of the upper connector, the top of the first cavity is connected with the lower end of a continuous pipe, the upper end of the continuous pipe is located on the ground and used for being connected with a pump truck, and the pump truck is used for mixing sand washing fluid and nitrogen to obtain a gas-liquid mixture; the lower end of the upper connector is connected with the upper end of the lower connector. The lower end of the lower connector is used for being connected with a sand washing tool. The upper portion of the pressure control valve set is located in the upper connector, the lower portion of the pressure control valve set is located in the lower connector, and a check valve is arranged at the lower end of the pressur