The invention discloses a separation achieving method for a single-phase-three-phase electric energy meter compatible calibration voltage system. The separation achieving method includes the following steps: A, the output of a three-phase power source serves as the unique power source; B, an independent three-phase power supply system is firstly formed by the three-phase power source, three-phase meter hanging bases and a three-phase standard meter; C, a switching relay K0 is additionally arranged in the A-phase voltage output UA of the power source; D, a switching relay K1 is additionally arranged in the voltage output UN of the power source; E, a switching relay K2 is additionally arranged in the A-phase voltage input UA of the standard meter. By means of the separation achieving method, as the four relays and a voltage isolation mutual inductor necessary in a single-phase system are additionally arranged, two independent power supply systems including the three-phase electric energy meter power supply system and the single-phase electric energy meter power supply system are generated through the same set of power source and standard meter.