The invention discloses a universal method for computing faults of power distribution networks with inverter distributed power sources. Subtransient-state and steady-state short-circuit equivalent models are built for short-circuit current characteristics of the inverter distributed power sources, and then the faults are computed. The universal method includes steps of 1, inputting system parameters and forming system admittance matrixes; 2, merging filter reactance into the admittance matrixes of the distributed power sources; 3, forming three-phase component iteration formats of subtransient-state currents; 4, computing internal potential positive-sequence components of steady-state models; 5, forming three-phase component iteration formats of steady-state currents; 6, solving equation in a unified manner to obtain three-phase components of subtransient-state fault voltages and three-phase components of steady-state fault voltages; 7, judging whether equations converge or not, completing iteration if the equations converge or carrying out the step 3 again to continue to carry out iteration. The universal method has the advantages that the phase-sequence hybrid universal method is suitable for computing the faults of the power distribution networks with the inverter distributed power sources.