The invention relates to a predictive phase shifting technology-based improved impedance distance measurement method. According to the technical schemes of the invention, the method includes the following steps that: a zero-sequence voltage sine curve is obtained; window slide is performed on a phase with maximum voltage, and voltage sine curves are superimposed, so that a zero-sequence voltage can be obtained, and the zero-sequence voltage is compared with a real zero-sequence voltage sine curve, so that a minimum phase angle can be obtained, wherein the phase angle is the phase angle of phase offset of the phase with the maximum voltage; similarly, a phase angle of phase offset of a phase with minimum current when a fault occurs can be obtained; zero-sequence impedance and line impedance can be calculated out according to the phase angle of the phase offset of the phase with the maximum voltage, the phase angle of the phase offset of the phase with the minimum current, and resistivity per kilometer of a line; and the position of the fault can be obtained through the impedance distance measurement method based on the line impedance, the zero-sequence impedance, the per kilometer resistivity per kilometer of the line, and the impedance rate per kilometer of the line. As indicated by actual verification, the improved impedance distance measurement method can assist in solving the problem of low accuracy of an original impedance distance measurement method.