The invention discloses a photoelectric sensor protection device. The photoelectric sensor protection device comprises a circuit insertion unit and a stand-by power supply, the circuit insertion unitis arranged on the top of an insulating casing, the insulating casing is inside provided with a transverse stress support bar, a state display screen is arranged under the transverse stress support bar, the bottom of the state display screen is provided with a pluggable connector, the back of the state display screen is provided with a minitype information processor, the upper part of the minitypeinformation processor is connected with the circuit insertion unit through a circuit protection resistor and a filter, and the stand-by power supply is arranged under the minitype information processor. Beneficial effects of the photoelectric sensor protection device are that comprehensive protection of the photoelectric sensor can be carried out in cable fixing, circuit protection, electromagnetic protection, insulation and water proofing ways, the photoelectric sensor protection device has a filtering function at the same time, and therefore the signal clearness and the sensing quality canbe improved.