Aiming at the problem that it is difficult to estimate the ground impedance of multi-electrode injected ground current field information transmission in real time, the real-time estimation method of multi-electrode injected ground current field ground impedance is proposed.Firstly, the geodesic equipotential surface around the electrodes is constructed by combining cylindrical and hemispherical surfaces, and the geodesic conductor geometry model of the current field of the multi-electrode injection ground is established according to the distribution of the equipotential surface, so that the ground impedance of the multi-electrode injection ground can be estimated through the integration of the length of the equivalent conductor.Under the four test conditions of mountain, forest, field and grassland, the distance between electrodes is set as 0.14, 0.57, 1 and 1.4 times of the depth of electrodes into the ground, and the current injection experiments are carried out for 4, 6 and 8 electrodes, and 4, 6, 8, 10 and 12 electrodes, and the average value of the relative error of the proposed method is 6.0%, and the experimental results show that the proposed method can meet the real-time ground impedance requirements under different injection conditions, estimation under different injection conditions.