Highway visibility detection device

The utility model relates to an expressway visibility detection device, which comprises a mounting shell, a detection device, a convex lens, a visible light filter and a light reflecting piece, and the detection device, the convex lens, the visible light filter and the light reflecting piece are sequentially arranged on the same straight line at intervals in sequence. The detection device is provided with a light emitter, an infrared emitter, a visible light detector and an infrared light detector which all face the convex lens, and the light reflecting part is an infrared light reflecting part which reflects back infrared light in the original path. Compared with the prior art, the method has the advantages that the number of backward heat dissipation photons of infrared light and the number of transmission photons of the infrared light can be obtained by transmitting and receiving the visible light spectrum and matching the visible light filter, so that the number of the backward heat dissipation photons of