Perfluorine filter with barrel and filter element convenient to disassemble and assemble

The perfluorinated filter comprises an outer cylinder body, one end of the outer cylinder body is fixedly connected with a connecting sleeve, and the connecting sleeve is composed of a first-stage connecting sleeve fixedly connected with the end face of the outer cylinder body and a second-stage connecting sleeve fixedly connected with one end of the first-stage connecting sleeve; a liquid outlet nozzle is fixedly arranged at the other end of the outer barrel body, a second-stage internal thread is formed in the inner wall face of the second-stage connecting sleeve, a first-stage internal thread is formed in the inner wall face of the first-stage connecting sleeve, the second-stage connecting sleeve is connected with a barrel cover through the second-stage internal thread, and a second-stage external thread matched with the second-stage internal thread is formed in the outer surface of the bottom of the barrel cover; a liquid inlet nozzle is fixedly arranged at the top of the barrel cover, and the first-stage