The invention discloses a river channel opening water surface garbage cleaning device which comprises a mounting plate mounted above a river channel opening, wherein fixed rods are welded at four corners of the mounting plate; the lower end of each of the fixed rods is fixed at the bottom of the river channel opening; and a mounting opening is formed in the side wall of one side of the mounting plate. The river channel opening water surface garbage cleaning device has the following advantages: fan blades and a screw rod are driven by the natural wind power to rotate to realize movement of a sliding block, a sliding plate and a pushing plate; the garbage on the water surface of the river channel opening is pushed above a rotating plate through the pushing plate, movement of the sliding plate drives the sliding block to move, and a jacking rod is jacked up through a sway rod, so that the rotating plate is driven to rotate, the garbage on the rotating plate is guided into a collecting boxfor centralized processing, and plenty of time and energy of working staff is saved; and the river channel opening water surface garbage cleaning device is scientific and reasonable, is provided witha baffle plate and a partition board to block the garbage flowing to the river channel opening later, so that the garbage is prevented from flowing to the outer side of the pushing plate and below the rotating plate, and the garbage cleaning effect is ensured.