Dust removal system for flue gas treatment in ironworks, steelmaking plants, ferroalloys plants, refractories, foundries, power plants, etc. Flue gas filtration of waste incinerator, coal-fired boiler and fluidized bed boiler. Asphalt concrete mixing, building materials, cement ceramics, lime, gypsum and other production sites. Smelting flue gas of aluminium electrolysis, lead, tin, zinc, copper and other rare metals is filtered and liquid-solid separation is carried out. Dust treatment and purification collection of chemical industry, coke, carbon black, dyestuff, pharmaceuticals, plastics, etc.