Ecological purification device for controlling farmland non-point source pollution

The utility model discloses an ecological purification device for controlling farmland non-point source pollution, which mainly comprises an intercepting channel body and an aquatic plant area, an intercepting assembly is arranged at a water inlet of the intercepting channel body and comprises an intercepting net, a rotating blade, a scraper blade and a collecting tank; transmission belt wheels are arranged at the rear ends of the rotating blades, driven belt wheels are arranged at the positions, corresponding to the two rotating blades, of the upper end of the intercepting net respectively, the two driven belt wheels are each provided with a transmission gear in a matched mode and rotationally connected with the intercepting net through a rotating shaft, and each transmission gear is provided with a rack in a matched mode. The far end of the rack is connected with a scraper; the rack is connected with the intercepting net through multiple groups of telescopic rods; the aquatic plant area is located behind th