Bag-type dust collector is a dry-type dust removal device. It is suitable for capturing small, dry, non-fibrous dust. The filter bag is made of woven fabric or non-woven felt, using the filtering effect of fiber fabric to filter the dusty gas. When the dusty gas enters the bag-type dust collector, large particles and heavy dust settle down due to gravity and fall into the ash hopper. The gas containing finer dust is filtered through the filter material, and the dust is retained, purifying the gas.