The dust collector is a kind of air purification equipment with small volume and high dust removal efficiency. Suitable for a variety of independent production of dust point, flexible and convenient, in situ dust collection, in situ treatment, can effectively ensure the cleanliness of the air. Basic structure composed of a dust collection box, centrifugal fan, bag (cartridge), set of dust collector and a microcomputer controller, etc., wherein, dust by fan suction through the suction pipe inhalation dust collector inside the box, using gravity and air upward, the first coarse grain dust is initial filter of filter and direct reduced dust collector, dust particles from the filter capture set in the outer surface, the clean gas through the filter filter decomposing and purifying into the clean room, which is composed of a blower from the air outlet discharge. The whole process of dust removal is a result of gravity, inertia force, collision, electrostatic adsorption, screening and other comprehensive effects.