Firstly, the electromagnetic compatibility design of the electromagnetic environment imaging early warning system for nuclear power plant is carried out in this paper. The electromagnetic compatibility design of the nuclear power plant is carried out by means of shielding, filtering and grounding. The possible conductor radiation and electric field radiation, which are easy to exceed the standard, are detected. The experiments show that the conductive emission energy of the power line of the nuclear power generation equipment is reduced by 32dBμV and the electromagnetic emission energy is reduced by about 25dBμV/m through the optimization of electromagnetic compatibility. The system can meet the requirements of the electro-optical imaging system for the electromagnetic environment of nuclear power plant in the complex electromagnetic environment of battlefield.