Chemical filtering device capable of automatically lifting isolating device

The utility model discloses a chemical filtering device capable of automatically lifting an isolating device, which comprises a connecting structure, the lower end of the connecting structure is sleeved with a supporting structure, the connecting structure comprises a limiting rod, a supporting guide rod, a filter screen, a sleeve, a threaded rod, an annular frame and a supporting ring disc, the sleeve is arranged at the bottom of the inner end of the connecting structure, and the supporting guide rod is arranged on the supporting guide rod. The upper end of the sleeve is fixedly connected with a supporting ring disc, the top end of the supporting ring disc is movably connected with an annular frame, the front end and the rear end of the annular frame are fixedly connected with supporting guide rods, the lower ends of the supporting guide rods are fixedly connected with a filter screen, and the left end and the right end of the annular frame are connected with a limiting rod and a threaded rod correspondingly