Method for ecologically restoring river channel by taking reclaimed water as main water source

The invention discloses a method for ecologically restoring a river channel by taking reclaimed water as a main water source. The method comprises the following steps: laying sewage interception pipes along both sides of the river channel to intercept sewage entering the river channel, and delivering the sewage to an urban sewage treatment plant all at once through an urban blow-off line; shutting down and removing direct-discharge pollution sources at both sides of the river channel, building landscape roads at both sides of the river channel, and setting a green isolation belt between each landscape road and the river channel; strictly supervising the running state of the urban sewage treatment plant so as to guarantee the water quality of the discharged reclaimed water to reach the A standard of the primary standard; reserving river channel bottom mud which is 0.1-0.2m thick, and clearing excessive bottom mud; leading the reclaimed water discharged from the sewage treatment plant into the river channel, ke