The invention relates to an optical light splitting device for receiving double wave bands through a common window and application of the optical light splitting device in camera shooting distance measuring equipment. The device comprises a common lens group, a reflector group, an imaging lens group, an avalanche transistor detector and a television detector, wherein the reflector group is arranged between the common lens group and the imaging lens group, and the common lens group, the imaging lens group and the television detector are arranged along the same optical axis; the two reflectors of the reflector group are parallel to each other and are arranged at two ends of the common lens group at a certain angle with the optical axis; the avalanche transistor detector is over against the light emitting surface of one reflector; the external incident main light penetrates through the shared lens group and the imaging lens group and then enters the television detector to be imaged, so the photographing or camera shooting function is achieved. And after penetrating through the shared lens group, other incident light rays from the outside are reflected to the avalanche transistor detector by the reflector group, so that a distance measuring function is realized. The device has the advantages of being simple in structure, low in manufacturing cost, small in size, light in weight, easy to carry, wide in application range, high in adaptability and the like.