Device and method for treating and maintaining riverway water body

The device comprises a mounting box extending in the front-back direction, connecting plates are inserted into the front side and the rear side of the mounting box correspondingly, the connecting plates are of L-shaped plate-shaped structures, floating components are fixedly arranged at the bottoms of the two connecting plates correspondingly, and the floating components are used for floating the mounting box on the water surface; a placement cavity is formed in the mounting box, an electric appliance assembly is arranged in the placement cavity, and power components are arranged at the bottoms of the two floating components; the installation box and the floating component are in control connection through the controller, manual fishing is not needed when water surface garbage is recycled, a user does not need to conduct garbage recycling all the time through the arrangement of the controller and a distance measuring sensor, the device can be placed on the river surface, garbage recycling can be conducted aut