Underwater hanging pipe moving device of sand suction dredger

The utility model provides an underwater hanging pipe moving device of a sand suction ship, and relates to the technical field of sand suction equipment, the underwater hanging pipe moving device comprises a hanging pipe main body, the hanging pipe main body comprises a first steel pipe, a second steel pipe, a third steel pipe and a fourth steel pipe, and further comprises a first adjusting assembly, a second adjusting assembly and a third adjusting assembly; the first adjusting assembly is arranged between the first steel pipe and the second steel pipe and used for driving the second steel pipe to freely move relative to the first steel pipe in the axial direction, and the second adjusting assembly is arranged between the second steel pipe and the third steel pipe and used for driving the third steel pipe to freely move relative to the second steel pipe in the axial direction. The third adjusting assembly is arranged between the third steel pipe and the fourth steel pipe and used for driving the fourth steel