The invention discloses an interference suppression method and an interference suppression device for the local discharge detection of equipment, which are used for solving the problem that various interferences existing in the detecting environment cannot be effectively suppressed in the prior art. The method of the invention comprises the following steps: detecting ultra high frequency signals inside and outside the equipment at the same time; synchronously comparing intensity of the detected ultra high frequency signals inside and outside the equipment; and determining which part of the ultra high frequency signals belongs to outside interference of the equipment according to the intensity. The technical scheme of the invention can fulfill the aim of suppressing the outside interference of the equipment and facilitate better analysis of various discharge phenomena inside the equipment.