An optical pest repeller includes at least two first light sources, at least two first photosensitive members, at least one second light source, and a processing unit. The second light source is located between the first photosensitive members in a second direction. By comparing a light-shading area with a threshold value, no matter which side of the second direction a human body enters by mistake, the second light source can be turned off in time. The safety of use of the optical pest repeller is improved greatly.