Secondary filter applied to oxygen generator

A secondary filter applied to an oxygen generator comprises a shell, a working cavity is formed in the shell, and a partition plate and a filtering structure are arranged in the working cavity; the partition plate is located below the working cavity, and the partition plate and the inner wall of the bottom of the shell are arranged at an interval, so that a gas flow channel is formed below the partition plate; the filtering structure is assembled in the working cavity, an air outlet side is formed at the front end of the filtering structure, and an air inlet side is formed at the rear end; an air inlet and an air outlet are formed in the lower portion of the shell and communicate with the working cavity. The air inlet corresponds to the air inlet side of the filtering structure, and the air outlet corresponds to the air outlet flow channel. The air inlet and the air outlet of the secondary filter are both arranged below the shell, the air outlet can be directly connected with the oxygenerator body, and the ai