The invention discloses an efficient dust remover-filter of a suction sweeper, characterized by comprising a sweeping suction system, a three-stage filter system and a dust remover outlet system; the sweeping suction system is composed of a main brush (1) and a dust collection box (2); the three-stage filter system is composed of a filter mesh (8), a cyclone pre-filtering air passage (3) and a cartridge filter (4); the dust remover outlet system includes a down-inducing air passage (6), a dust remover outlet (7) and a vacuum fan (5); by providing the three-stage filter system and modifying the shape of the filter air passage, cyclone flow and centrifugal force for dust-bearing gas filtering process are increased, and improved dust removal efficiency and prolonged life are imparted to the dust remover of the sweeper; experiments and simulation analysis show that dust-bearing gas entering the cyclone pre-filtering air passage has a capturing and precipitating rate of up to 98% for grits having a particle size of 0.1-1.5 mm.