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This invention provides a photoelectric sensor comprising a transmitter and a receiver. Both the transmitter and receiver include: a housing; a circuit board disposed inside the housing; and a cable electrically connected to the circuit board. The cable in the receiver is a four-core cable, one of which has a signal input core for switching between normally open and normally closed modes. This photoelectric sensor allows for rapid L / D switching by inputting a control signal through the four-core cable with the signal input core. It eliminates the need for adjustment knobs, sealing rings, rotary switches, and small substrates required for L / D switching in the original three-core cable configuration, effectively simplifying the sensor structure, reducing production costs and assembly time, and simultaneously improving the automation level of the photoelectric sensor.