Electromagnetic compatibility is an important technical index of electrical equipment or system, and its requirements directly affect the performance of the product. In this paper, the reason of electromagnetic compatibility of electrooptics tracking equipment and the necessity of electromagnetic compatibility processing are introduced. And then expounds the principle of power supply and communication signal filtering technology, and on the issue of the solution, through a combination of power filter and signal filtering technology, a photoelectric tracking equipment, system analysis of electromagnetic compatibility problems existing in equipment and technical verification, electromagnetic compatibility requirements to GJB151A, filtering method can provide a reference for electromagnetic compatibility engineering practice of optoelectronic tracking equipment.