Cleaning device for water conservancy river channel surface

The invention relates to the technical field of river channel cleaning, and discloses a water conservancy river channel surface cleaning device which comprises a ship body and a conveying frame rotationally connected to the ship body, the conveying frame is provided with a conveying belt assembly used for conveying garbage, and the ship body is provided with a garbage containing bin; inserting blocks are fixed to the two sides of the conveying frame, rotating blocks are rotationally connected to the inserting blocks through connecting shafts, a filtering frame is fixed to the rotating blocks, and a plurality of filtering railings distributed at equal intervals are fixed to the filtering frame; a first hinge block is fixed to the filtering frame, a second hinge block is fixed to the conveying frame, small-size impurities flowing out of the filtering frame can be filtered, the size of garbage can be distinguished in the garbage treatment process, garbage of different sizes can be classified conveniently, the ri