Closed negative pressure desilting device with self-cleaning function

The utility model discloses a closed negative-pressure desilting device with a self-cleaning function. The closed negative-pressure desilting device comprises a negative-pressure desilting body, four desilting assemblies and a self-cleaning assembly, wherein the four desilting assemblies are connected with the negative-pressure desilting body; the self-cleaning assembly is connected and matched with the four sludge suction assemblies; the negative pressure desilting body comprises a body and a drainage assisting pump, the body is provided with a flow inlet pipe, a mixing chamber and a diffusion chamber, the left end of the mixing chamber is connected with the diffusion chamber, and the flow inlet pipe is inserted into the mixing chamber and is relatively matched with the diffusion chamber. When the self-cleaning device is implemented, the opening and closing channels of the electric control three-way valves can be controlled, so that a closed self-cleaning loop is realized, self-cleaning in the pipe is realiz