The invention discloses a method for identifying signals and the interference signals in ultrahigh frequency partial discharge detection in electrical equipment. The method comprises the following steps of: a. acquiring ultrahigh frequency signals near a device to be detected by using four sensors so as to obtain four paths of ultrahigh frequency partial discharge signals; b. carrying out the calculation of time delay by adopting a self-adaptive time delay calculation method based on a minimum mean square algorithm according to the obtained four paths of ultrahigh frequency signals, so as to obtain three time delay values; c. substituting the three time delay values obtained from the calculation into a positioning equation set, and solving the position of a discharge power supply by using a simulated annealing algorithm; and d. judging whether a detected signal comes from the interior or the exterior of the device according to a positioning result of the discharge power supply, so as to identify a partial discharge signal and an interference signal. By adoption of the method, the identification of the discharge signals and the interference signals in the partial discharge detection of the electrical equipment is realized and improved, and particularly the identifications to the discharge signals of periphery equipment and the interference of the equipment to be detected are realized.