LCM type long-bag pulse dust collector is a new type of high-efficiency bag-type dust collector developed on the basis of conventional short-bag pulse dust collector. It not only combines the advantages of sub-chamber backflushing and pulse jet cleaning, but also lengthens the bag to give full play to the powerful jet cleaning of compressed air. It overcomes the shortcomings of low intensity of backflushing in separate chambers, and simultaneous pulse jet cleaning and dust filtration, and prevents the problem of dust reattachment and out-of-control, thereby increasing the filtration speed, saving energy consumption for cleaning and prolonging the life of the filter bag.