The utility model relates to a one-way light transmitting cat eye, which comprises a cat eye main body, a viewing window, a convex lens, an outer convex lens and an inner convex lens arranged at a part of the cat eye main body adjacent to the viewing window, wherein the convex lens is positioned at a position of the cat eye main body far away from the viewing window, and one-way transparent glass is arranged at the outer end of the cat eye main body. The light transmission direction of the one-way light transmitting glass is from the outside to the inside. The utility model can ensure that light in a room can not be seen by people outside a room, thereby realizing the anti-theft and anti-disturb purposes.