Abstract: To address issues of electric field interference between three-phase conductors, an optimization simulation model of the induction electrode structure was established, and a probe structure with shielding on top layer was proposed. A non-contact voltage measurement method suitable for double-layer parallel plate electrodes was proposed, a set of non-contact three-phase voltage measurement device was developed and actual tests in the distribution box were conducted. Results show that within the voltage range of 1-400 V, the maximum relative error of the device in measuring the power frequency voltage is 0.9%, and it is suitable for measuring three-phase voltages under various working conditions.