Trash blocking device for fishway

The utility model provides a trash holding device for a fishway. The fishway comprises a bottom plate, side walls located on the left side and the right side of the bottom plate and a grating cover plate located on the tops of the side walls. The fishway is divided into a fishway upstream section and a fishway downstream section by a dam; the trash blocking device comprises two floating body assemblies which can float on the water surface to block floating objects. The two floating body assemblies are arranged on the two side walls of the upstream section of the fishway correspondingly and used for preventing floating objects on the water surface from being attached to the grating cover plate of the upstream section of the fishway. Due to the fact that the floating body assembly can float up and down along with the water surface, when the water level rises in the flood season, the floating body assembly also rises along with the water level, and therefore water surface floating objects are effectively blocked