Device for generating high-speed water flow retaining wall at fishway inlet

The invention discloses a fishway inlet high-speed water flow retaining wall generating device which comprises a water pump and a high-speed water flow nozzle connected with the water pump. The high-speed water flow nozzle is arranged on the upstream of a fish inlet of a fishway, the flow outlet direction is perpendicular to or forms an acute angle with the river direction, the high-speed water flow nozzle is in a flat horn shape, an inlet is circular, an outlet is in a vertical slender rectangle shape, the high-speed water flow nozzle is installed on a high-speed water flow nozzle support, the high-speed water flow nozzle support is fixed to a riverbed, and the water pump is arranged in a suspended mode. A high-speed water flow wall can be manufactured at the upstream of the fish inlet, fishes are prevented from missing the fish inlet to continue to move towards the upstream, meanwhile, water flow lifted by the flow deflecting plate brings a large amount of air into water to form bubbles, flow deflecting oxy