The invention discloses a photoelectric sensor in horizontal and vertical state, which comprises a base, a rear seat and a case. The base is perpendicular to the external wall surface of the rear seat; the case is internally provided with a horizontal baffle; the front section of the horizontal baffle is provided with a photoelectric double-interrupter sensing module; the photoelectric double-interrupter sensing module is provided with a through hole in the center for a modulation rod to go through; infrared transmitters and infrared receiver groups are correspondingly arranged in the front and the back, and on the left and the right of the photoelectric double-interrupter sensing module respectively; all the infrared transmitters and infrared receivers are connected with a circuit control system arranged in the case; and the circuit control system comprises an integrated circuit plate which is externally connected with a buzzer, a data communication interface, a power supply socket, a signal transmitting antenna, a battery, a status indicator, a power supply, a brake switch and a wireless signal transmitting switch. Adopting a hanging modulation rod to convert infrared rays into a sensing source, the photoelectric sensor is characterized by simple structure, convenient operation, directviewing property, reliability, economical practicality, wireless signal output and the like and can meet the requirements of applications such as engineering design, construction, supervision, automatic control and the like.