Pipeline automatic cleaning system and cleaning method

The invention discloses a pipeline automatic cleaning system which includes an oil phase and an aqueous phase of an explosive preparation process; the oil phase is converged to an aqueous phase pipeline where the aqueous phase is located through an oil phase pipeline, the end part of the aqueous phase pipeline is connected to a crude emulsion tank, and the end part of the aqueous phase pipeline is provided with an oil-water mixed blow-down valve; the oil phase pipeline is provided with an oil phase switch valve, and a first air empty-blowing valve and a first blow-down valve, wherein the oil phase switch valve is arranged on an end port of the oil phase, and the first blow-down valve is close to the aqueous phase pipeline; the aqueous phase pipeline between the aqueous phase and the oil phase pipeline is provided with a second blow-down valve, an aqueous phase pump, and a second air empty-blowing valve and a water storage filter cleaning valve, wherein the second blow-down valve is close to the oil phase pipeline, the water pump and the water storage filter cleaning valve are arranged at the tail end of an aqueous phase switch valve on the end port of the aqueous phase. The invention discloses an automatic cleaning method through gas blowing-water washing-gas blowing. The system and the method can clean material pipelines cleanly, achieve automatic cleaning or onekey cleaning, make hard things simple, are convenient and efficient, and reduce the labor intensity of workers.