The invention relates to a method of determining line loss abnormity based on phase angle errors of electric energy meters, and belongs to the technical field of electric power. The method of determining line loss abnormity based on phase angle errors of electric energy meters includes the steps: taking the phase angle value, the abnormity occurrence number and the line loss rate section of the belonged court or line as the criterion, respectively performing situation determination on the acquisition data of three-phase three-line and three-phase four-line electric energy meters; and accordingto the phase angle data, the abnormity occurrence number and the line loss rate section data of the belonged court or line, performing condition restriction, satisfying the conditions so as to be able to determine that the phase angle errors of the electric energy meters cause line loss abnormity. The method of determining line loss abnormity based on phase angle errors of electric energy meterscan accurately screen the phase angle errors caused by the faults of the electric energy meters or man-made electricity stealing, can provide powerful data support for field inspection staff, and canimprove the work efficiency of line loss treatment.