Freezing temporary plugging valve replacing device and method

The invention discloses a freezing temporary plugging valve replacing device and method, and relates to the technical field of petroleum and natural gas exploration and development. The device comprises a liquid nitrogen Dewar tank, a liquid nitrogen transmission pipeline, a low-temperature electromagnetic valve, a corrugated pipe, a temperature controller and a thermocouple, the low-temperature electromagnetic valve is connected to the liquid nitrogen conveying pipeline in series, one end of the liquid nitrogen conveying pipeline is connected with the liquid nitrogen Dewar tank, the other end of the liquid nitrogen conveying pipeline is connected with the corrugated pipe through the low-temperature electromagnetic valve, and the corrugated pipe is wound on a wellhead device in a rotating and winding mode. And the temperature controller sets a temperature range required during operation, and controls the opening and closing of the low-temperature electromagnetic valve according to the temperature feedback of