The invention relates to a method for measuring a transient electromagnetic field of a transformer station, which comprises measuring point selection, an access mode and a recording method, wherein the measuring point selection is to take a disturbance source possibly causing abnormal operation of secondary equipment as a measuring point; the measuring probe access mode adopts a measuring circuit consisting of a balun, an attenuator and an integrator and adopts an optical fiber to transmit signals; and the recording method adopts digital oscilloscopes with different memory depths for recording according to the characteristics of the disturbance source to acquire the transient interference level of the transformer station. The method realizes measurement of the transient electromagnetic field of the transformer station by accessing measuring probes on a CT interface, a PT interface and a station power interface to record measuring data according to the scale, structure and debugging proposal of the transformer station. The invention correctly masters the characteristics of the transient electromagnetic field of the transformer station to provide the reasonable method for measuring the transient electromagnetic field of the transformer station; and the measuring method can accurately evaluate the transient interference level of the transformer station and ensure safe and reliable operation of an electric network.