The characteristics of the trenchless mud purification system treatment plan are: 1) Clean up the mud with a large amount of sediment in the mud 2) The treated mud has high viscosity 3) The mud supply is continuous and the returned mud is not enough to meet the drilling requirements 4) Both sides of the crossing will return mud. 5) Reduce the amount of mud and pollution to the environment 6) The mud performance is stable, which can reduce the occurrence of underground safety accidents caused by mud with poor performance, so as to ensure the smooth progress of the crossing project.