PTFE (Polytetrafluoroethylene) filter bag with multi-stage filtering effect

The invention discloses a PTFE filter bag with a multistage filtering effect, which comprises a base, a first mounting cylinder, a first filter bag, a second mounting cylinder and a second filter bag, the first mounting cylinder is arranged at the bottom of the base, the first filter bag is detachably mounted at the bottom of the first mounting cylinder, the second mounting cylinder is arranged at the bottom of the base, and the second filter bag is detachably mounted at the bottom of the second mounting cylinder. And the diameter of the second mounting cylinder is smaller than that of the first mounting cylinder. According to the PTFE filter bag with the multi-stage filtering effect, the effective filtering area can be kept unchanged, meanwhile, the size of the first filter bag is reduced, the first filter bag can be supported, the filtering effect of the first filter bag and the filtering effect of the second filter bag are guaranteed, the blades can be completely opened, interference is avoided, the airflo