Bridge drainage system expansion joint with good flexibility

The utility model discloses a bridge drainage system expansion joint with good flexibility, which comprises an elastic and telescopic corrugated pipe with a rectangular-like cross section, the corrugated pipe has nine wave crests, the telescopic range of the nine wave crests in a natural state is 0-15cm, one end of the corrugated pipe is fixedly connected with an upper connecting pipe which is made of rubber and has a rectangular-like cross section, and the other end of the corrugated pipe is fixedly connected with a lower connecting pipe which is made of rubber. And the other end of the corrugated pipe is fixedly connected with a lower connecting pipe which has a rectangular-like cross section and is made of rubber. The corrugated pipe with the rectangular cross section is arranged, compared with a traditional telescopic joint, the telescopic length is greatly increased, the first steel ring and the second steel ring are arranged, the phenomenon that the rubber hose is flat due to negative pressure during dr