Inflatable desilting structure for mud trap and desilting method of inflatable desilting structure

The invention provides an inflatable dredging structure for a mud trap. The inflatable dredging structure comprises a mud trap and sewage pipes communicating with the two sides of the mud trap respectively; a well cover is arranged at a well mouth of the mud trap; a well bottom plate is arranged at the bottom of the mud trap; an air bag is fixed on the well bottom plate; at least one inflation inlet is formed in the air bag; each inflation opening is connected with a rubber hose; the free end of the rubber hose is fixed on the inner side of the well wall; the diameter of the air bag in an uninflated state is equal to that of the mud trap; a sludge settling area for sludge settling is formed between the upper surface of the air bag and the inner sides of the well walls on the two sides of the air bag; when the air bag is inflated through a rubber hose to reach set pressure, the bottom face of the sludge settling area on the rubber air bag rises to be flush with the bottom face of the sewage pipe; and an air in