Abstract: A device of deodorizing and minimizing VOC in exhaust gas with photocatalyst is equipped with UV lamp wrapped with photocatalyst coating fiberglass sleeve, disposed in an exhaust gas treatment chamber. At an inlet end, exhaust gas passes an activated carbon honeycomb plate which adsorbs VOC gas of the exhaust gas. The photocatalyst-based exhaust gas treatment chamber is installed in a manner to face the sun. Sunlight falls on the exhaust gas treatment chamber, thus causes the activated carbon honeycomb plate to release the otherwise adsorbed VOC gas. After that, undergoing photocatalyst-based exhaust-gas-borne VOC treatment system, the released VOC gas is oxidized and discharged without odorous.