Temporary plugging device and method for oil pipe operation under pressure of gas well

The embodiment of the invention discloses a temporary plugging device and method for oil pipe operation under pressure of a gas well, and belongs to the technical field of downhole tools in the petroleum industry. The temporary plugging device for the gas well under-pressure tubing operation comprises an outer barrel, a limiting clamping ring, an inner sliding sleeve, a soluble supporting ring, an elastic piece, a backing ring and a sealing ring. The limiting clamping ring, the inner sliding sleeve, the soluble supporting ring and the backing ring are sequentially installed in the outer cylinder from top to bottom, and the limiting clamping ring and the backing ring are detachably connected with the outer cylinder. The elastic piece is located in a gap between the soluble supporting ring and the outer cylinder. One end of the elastic piece is connected with the inner sliding sleeve and the other end is connected with the backing ring; the soluble supporting ring is configured to be capable of being dissolved