The invention discloses a field calibration method and a transient voltage measurement method for a convertor station direct current field transient voltage non-contact measurement device. The field calibration method is combined with the standard direct-current electric field environment, the standard alternating-current electric field environment and the field installation environment under thelaboratory condition to obtain a proportionality coefficient k1 and an electric field mill input/output proportion k2 of the electric field which is generated at the electric field mill position by high-voltage polar line voltage to finish calibrating the measurement device. The blank of field calibration technologies of the convertor station direct current field transient voltage non-contact measurement device is filled up, and furthermore, transient voltage measurement accuracy is improved.