Telescopic ponding-preventing breathing tube of critical disease nursing breathing machine

The invention relates to the technical field of breathing tubes, and discloses a critical disease nursing breathing machine telescopic water accumulation prevention breathing tube which comprises two corrugated tubes, the opposite ends of the two corrugated tubes are fixedly communicated with connectors, the opposite ends of the two connectors are jointly in threaded connection with a drainage inner ring, and the drainage inner ring is in threaded connection with a drainage outer ring. A rotating groove is formed in the outer side wall of the drainage inner ring, and a plurality of drainage holes are formed in the inner side wall of the rotating groove; a sliding groove, a sliding block, a first spring, a semi-sealing block, a vertical groove, a clamping groove, an L-shaped rod, a drawing opening, a clamping block, an anti-falling groove and an anti-falling block are arranged between the first connecting pipe and the second connecting pipe, so that when water accumulated in the water collecting cup is too muc