Method for ecological purification of river

The invention discloses a method for ecological purification of a river, which comprises the following steps: (1) observing ecological environments on two sides of the river, and arranging sand-fixing and buffering plant forests on two sides of a river bank close to positions where water flow is rapid; (2) the water quality of the river is detected, an interception net is arranged on the upstream of an area where the water quality of the river is seriously polluted, and a large number of pollutant purification materials are adsorbed on the interception net; (3) a fishpond ecological chain is arranged at the downstream position of the intercepting net, and further purification of river pollution is achieved; (4) communicating a marsh or a wetland close to the polluted river with the river, so that the water flow of the river is obstructed by the terrain, and the speed of the water flow is slowed down; and (5) arranging a river sewage monitoring point at the downstream of the water flow, detecting whether the w