Optical platform of transmission-type smoke meter with protection lens

The invention relates to a smoke measuring device of a diesel vehicle and in particular relates to an optical platform of a transmission-type smoke meter with a protection lens. The platform comprises a fan, a detection pipeline, a gas chamber pipeline, a smoke charging pipe and a photoelectric detection unit. As the optical platform of the transmission-type smoke meter is additionally provided with the protection lens device, the direct contact between oil gas-containing smoke discharged by engines and the surface of lenses can be avoided; the protection lens device can be conveniently pulled out and washed; the use convenience and the overall performance of the instrument are improved to a great extent.