Portable visibility transmissometer

The invention discloses a portable visibility transmissometer. An air inlet (15) or air outlet (16) communicated with an air pump (14) is formed in a closed box body (17) of the portable visibility transmissometer; a light source is a laser (1) outputting visible lights; an optical antenna located in the box body (17) comprises a light intensity detection integrating sphere (3), a collimating lens set (5), reflecting mirrors (7), a light filter (10) and a light intensity receiving integrating sphere (11) which are sequentially arranged on a light source light path, wherein the reflecting mirrors (7) are arranged at the two ends of a light path reflecting region (8), and a light intensity detector (4) and a photoelectric detector (12) are respectively arranged on the inner walls of the two integrating sphere balls; and a measurement and control component (13) is composed of a computer and a control and acquisition module which are respectively and electrically connected with the air pump (14), the laser (1), t