Compressed air drainage device for wharf

The invention relates to a compressed air drainage device for a wharf, comprising an upper sealing head (9), a cylinder (14) and a lower sealing head (4), wherein a clapboard (13) is arranged in the cylinder (14) along the vertical direction, the left side and the right side of the lower end of the clapboard (13) are respectively provided with a first inclined plate (6) and a second inclined plate (15), a cover plate (16) is arranged below the first inclined plate (6) and the second inclined plate (15), a support (2) and a collector (3) are arranged at the bottom of the lower sealing head (4), a blowdown connecting pipe (1) is connected to the bottom of the collector (3), a drainage connecting pipe (17) is connected on the outer wall of the collector (3), a first connecting pipe (8) and a second connecting pipe (12) are arranged on the cylinder (14), and a manhole assembly (7) is arranged below the first connecting pipe (8).