Two-stage filtering self-cleaning filter adopting internal and external filter cylinders

A two-stage filtering self-cleaning filter adopting internal and external filter cylinders comprises a seal casing constituting a filter cavity, a pollution absorption pipe and a driving device, wherein a first-stage filter cylinder and a second-stage filter cylinder are arranged in the casing, a water inlet communicates with an inner cavity of the first-stage filter cylinder, water enters an outer cavity of the first-stage filter cylinder through the inner cavity of the first-stage filter cylinder to realize first-stage filtration, the first-stage filter cylinder is covered with the second-stage filter cylinder, the outer cavity of the first-stage filter cylinder is divided into an inner cavity of the second-stage filter cylinder and an outer cavity of the second-stage filter cylinder by the outer cavity of the first-stage filter cylinder, and water enters the outer cavity of the second-stage filter cylinder through the inner cavity of the second-stage filter cylinder to realize second-stage filtration. Acco