The invention discloses an electric power data processing method and processing apparatus. The method comprises: according to a current value, collected by a current transformer, of a power supply line, a first image is obtained, wherein the current transformer is arranged on the power supply line; the first image is processed according to an interpolation method to obtain a second image; and whether a current value corresponding to the second image meets a preset current value characteristic is determined; if not, warning information is sent out, wherein the warning information is used for indicting abnormity of the power supply line. According to the invention, a technical problem that a subway load characteristic at any time can not be determined accurately because information missing and graph distortion that are caused by a scatter diagram can not be avoided according to related technologies can be solved.