Fishway inlet device and fishway inlet structure

The utility model belongs to the field of hydraulic construction facilities, and particularly discloses a fishway inlet device capable of adapting to different water level changes and a fishway inlet structure comprising the fishway inlet device. The fishway inlet device comprises a device body and a buoy arranged on the device body. A flexible connecting port and a fish inlet are formed in the two ends of the device body respectively, and a water pump is arranged in the buoy. A device main body of the fishway inlet device is provided with a flexible connecting port; the flexible connector is connected with the downstream end of the fishway, so that the degree of freedom of movement of the device body can be guaranteed; meanwhile, a buoy with a water pump is arranged on the device main body; the weight of the device main body can be increased or reduced by pumping water into the float bowl or pumping water out of the float bowl through the water pump; therefore, the fishway inlet device can float up and down