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In order to solve the problem that the multi - rotor unmanned aerial vehicle (UAV) is caused by environmental magnetic interference in the course of flight operation, a magnetic interference detection technology of multi - rotor unmanned aerial vehicle based on flight path deviation and differential positioning using DGPS is proposed. The basic principle is that when the multi-rotor UAV by the magnetic field interference, the flight path will deviate from the preset path, to detect the deviation of its track distance, compared with the threshold can be used to determine whether there is environmental interference. The experimental results show that this method can effectively detect the anomaly of environmental magnetic field, and in some cases, it is more reliable and less false than the traditional magnetic heading angle error detection method. The combination of flight path deviation detection method and magnetic heading angle error detection method can effectively improve the accuracy of environmental magnetic field anomaly detection and reduce false alarm rate.