The invention discloses a photo-oxygen catalytic device for industrial waste gas. It comprises a shell, one end of the shell is provided with a suction fan, the other end of the shell is provided with an outlet fan, the interior of the shell is divided into an upper layer, a middle layer and a lower layer, the upper layer of the shell is a primary photo-oxygen catalytic chamber, and the middle layer of the shell is Secondary photo-oxygen catalytic chamber, the lower layer of the shell is a filter chamber, one side of the primary photo-oxygen catalytic chamber is connected with the suction fan, the other side of the primary photo-oxygen catalytic chamber is connected with one side of the secondary photo-oxygen catalytic chamber, the second The other side of the secondary photo-oxygen catalytic chamber is communicated with one side of the filter chamber, and the other side of the filter chamber is connected with the outlet fan. The beneficial effects of the invention are as follows: the industrial waste gas can be fully cracked to be degraded into low molecular compounds; through the combined use of the filter screen and the activated carbon, on the one hand, the suspended particulate matter in the gas can be adsorbed, and on the other hand, the low molecular compounds can be further processed, Then the industrial waste gas is purified; the purification effect is good, the sterilization effect is good, the environment is protected, and it is green.