The invention provides a photoelectric switch installation adjusting system. The photoelectric switch installation adjusting system comprises a guide rail, a sliding block, a support frame, an adjusting nut and bolt, a first fixed screw, a second fixed screw and a third fixed screw; the guide rail is fixed by using the third fixed screw; the sliding block is placed in a groove of the guide rail so as to slide freely; the sliding block is fixed on the guide rail by using the second screw; the support frame is arranged on the sliding block and is fixed by using the first screw; a photoelectric switch is vertically fixed on the support frame; and the height of the support frame is finely adjusted through adjustment of the adjusting nut to enable a transmitting end and a receiving end to be aligned with each other. According to the photoelectric switch installation adjusting system, the structure is simple, the cost is relatively low, the installation is easy, the adjustment is convenient, the labor intensity of workers is relieved greatly, and the structural stability is good.