The metal dust removal filter bag is made from a nonwoven-laid metal fiber sintered at high temperature, then welded into a bag form. The metal membrane consists of three composite layers (metal plate mesh, coarse metal fiber layer, fine metal fiber layer), offering high filtration precision, high porosity, high air permeability, high temperature resistance, corrosion resistance, and resistance to airflow impact and mechanical vibration. It is suitable for high-temperature dust-containing gas filtration in metallurgy, chemical industry, waste incineration, glass, ceramics, coal-fired power plants, and cement industry. It ensures outlet dust concentration ≤5 mg/m³, supports online backflushing and offline cleaning, allowing regeneration and reuse, with a long service life and easy recycling without secondary pollution.