Non-constant flow water-saving type turning plate step type fishway and fish migration method

The invention discloses a non-constant flow water-saving turning plate step type fishway and a fish migration method, a plurality of turning plates are arranged in a fishway body along the length direction of the fishway body, and each turning plate transversely partitions the fishway body, so that a multi-stage migration pool enclosed by two adjacent turning plates is formed; the elevation of the upper end of each turning plate is gradually reduced along the water flow direction; all the turning plates can connect or disconnect the adjacent migration ponds. The first-level turning plate, the second-level turning plate, the third-level turning plate and the like are sequentially opened and closed according to the set rhythm until the turning plate at the uppermost end, fishes enter the migration pool at the upper level in the turning plate opening process, and dam turning is achieved through step-by-step migration. According to the fishway, the requirement for the swimming capacity of fishes is basically avoi