The invention relates to a device for collecting garbage on the water surface and belongs to the technical field of environmental protection. In the device, two rotating blades in a power assembly are fixedly jointed in two grooves at 180 degrees on a shaft sleeve; the left end and the right end of a connecting shaft I are respectively fixed with the shaft sleeve and a driven wheel; the left end of a connecting shaft II is fixedly connected with an output shaft of an electric pulse motor II while the right end is fixedly connected with a driving wheel; the driving wheel is moveably connected with the driven wheel through a driving belt; the two connecting shafts in the power assembly are moveably connected with two holes of an extension part; the electric pulse motor II of the power assembly is fixedly connected with a lug boss II of a support component; a garbage storage is arranged in the extension part and is limited by a left baffle, a rear baffle and a right baffle of the extension part and a lug boss I of the support component; two transmission shafts of a driving steering assembly are moveably connected with the two holes of the support component; two electric pulse motors of the driving steering assembly are fixedly connected with the rear part of a base plate of the support component. The device can replace manpower for realizing the automatic efficient cleaning for the garbage on the water surface in rivers, lakes, and the like. The device has the advantages of stable and reliable work, simple structure, low cost and convenience in operation.