The invention relates to the technical field of excavators, and discloses a hydraulic dredging bucket connecting structure which comprises an excavating arm mechanism, an excavating mechanism is movably mounted at the free end of the excavating arm mechanism, a bucket body is movably mounted at one end of a small arm body, a bucket suspension mechanism is arranged in the excavating arm mechanism, and the bucket suspension mechanism is movably mounted at the other end of the small arm body. A
butt joint mechanism is arranged between the digging arm mechanism and the digging mechanism. According to the hydraulic dredging bucket connecting structure, the lifting seat and the excavating mechanism can be connected in advance through the lifting sling, stable lifting and centering adjustment are conducted through the vertically-arranged bucket suspension mechanism, and therefore connection of a first positioning point is achieved; convenient manual pre-
butt joint of a second positioning point is achieved by means of a movable hanging lug of the excavating mechanism and the excavating arm mechanism, finally, the excavating arm mechanism pushes the movable hanging lug to reset along a preset path to achieve positioning of the second positioning point, and final connection is completed through the
butt joint mechanism. Therefore, the proficiency operation requirement on accurate positioning of the digging arm mechanism is effectively reduced.