Water surface environment treatment ship for water conservancy project and water surface treatment method of water surface environment treatment ship

The water surface environment treatment ship comprises a ship body, a cab, a mesh belt type conveying device, a fishing device and a collecting hopper, the fishing device is located on the front side of the mesh belt type conveying device, and the collecting hopper is located on the rear side of the mesh belt type conveying device; blocking nets located on the two sides of the net belt type conveying device in the width direction are fixed to the ship body. The fishing device comprises a rotating shaft, a rotation driving mechanism, an inflation and deflation mechanism and two sets of fishing hooks, the rotating shaft extends in the width direction of the mesh belt type conveying device, the rotation driving mechanism is used for driving the rotating shaft to rotate, and the two sets of fishing hooks are arranged and installed with the axis of the rotating shaft as the circumferential direction; one group of fishing hooks comprises a plurality of fishing hooks which are mounted at intervals in the axial direc