A first
cofferdam is arranged on the periphery of a kettle opening,
water flow in multiple directions formed at the kettle opening is subjected to preliminary diversion constraint, then a second
cofferdam is arranged on the outer side of the first
cofferdam in a spaced mode, a river channel is formed between the first cofferdam and the second cofferdam, and the two cofferdams are cooperatively constrained, so that the
water flow in the multiple directions is subjected to preliminary diversion constraint. When the
water flow passes through the slope grooves, a new water flow direction can be formed, then the slope grooves in the first cofferdam and the second cofferdam are utilized to enable the water flow to flow down from the slope grooves, and then a new gravity fall is formed to drive the generator below to generate
electricity. The device ingeniously utilizes the fall naturally formed when the water flow passes through the slope grooves, and the
potential energy utilization efficiency of the water flow is improved; the increase of the water flow fall is directly converted into more power sources of the power generation unit, so that efficient and
sustainable energy conversion is realized, and the device can adjust the water flow direction and the water flow speed through the cooperation of the new river channel and the slope groove, so that the power generation efficiency is improved, and the
utilization rate of
water resources is also improved.