The invention provides a double reflector transmission visibility device, which comprises a box body and a laser arranged in the box body. A glass window is inlayed on the front wall of the box, wherein the inner wall of the top of the box is a screen; a camera is arranged under the screen; and the camera is connected with a computer. Laser beams emitted by the laser are divided into horizontal and vertical laser light beams by a beam splitter, wherein the horizontal laser light beam passes through a centre hole of a front reflector in the box, is reflected by a short-range reflector outside the box and then is refracted to the front view reflector in the box; the vertical laser light beam passes through a centre hole of an upper reflector in the box, is reflected by the short-range reflector outside the box and then is refracted to an inclined upper reflector in the box; and reflected images of the two laser light beams are transmitted on the screen of the top of the box and in the visual field of the camera. The device of the invention can monitor the visibility in real time, has the advantages of simple working principle of the device, stable, timely and accurate detected data, low requirement on transmitting devices and acquisition devices, rapid and convenient assembly and debugging, and convenient popularization and use.