The utility model discloses a multifunctional measurement circuit, and the circuit comprises a single-chip microcomputer and an analog-digital converter connected with the single-chip microcomputer. The analog-digital converter is connected with a voltage transformer and a current transformer. The circuit is used for a three-phase frequency-doubling induction withstand voltage testing device, can measure and calculate electric parameters such as the voltage, current, active power, power factor and frequency of to-be-tested equipment at the same time, guarantees the high precision of measurement, shortens the on-site testing time, improves work efficiency, and generates economic benefits.