Water treatment device for river ecological management

The water quality treatment device comprises a water collecting tank, the bottom wall of the water collecting tank is communicated with a water conveying pipe, the water outlet end of the water conveying pipe is communicated with a filter box with an upper opening, a cover plate is movably buckled at the opening of the filter box, and an impurity recycling box is arranged at the bottom of the filter box; an inner cavity of the filter box is divided into a first chamber, a second chamber, a third chamber and a fourth chamber through a primary filter screen, a secondary filter screen and a tertiary filter screen which are arranged in sequence; a purified water outlet is formed in the position, close to the bottom, of the side wall of the fourth cavity, sewage outlets communicated with the impurity recycling box are formed in the bottom walls of the first cavity, the second cavity and the third cavity respectively, and an opening and closing valve is arranged on each sewage outlet; servomotors are arranged on th