Ecological purification device and method for river basin non-point source pollution

The invention discloses an ecological purification device and method for river basin non-point source pollution. The device comprises a device body and a purification box, the purification box is arranged at the rear end of the device body and detachably connected with the device body, a port is transversely formed in the front end face of the device body, and a plurality of sets of filtering guide pipes penetrating through the device body are arranged on the inner side face of the port at equal intervals; the left side and the right side of the device body are each provided with a hydrodynamic wheel, the two hydrodynamic wheels are connected through a connecting rod, a water wheel is arranged on the connecting rod between every two adjacent sets of filtering guide pipes, a liquid collecting hopper is arranged above the device body on the rear side of each water wheel, and a planting plate is erected on the device body on the rear side of the liquid collecting hopper; filter screens capable of moving up and d