In order to achieve ohmic heating for liquid food, by using rectifier and inverter technology, continuous ohmic heating device was designed. The equipment was consisted of controllable pulsed power supply, ohmic heating chamber, pump and flow controller. Controllable pulsed power supply can output bipolar-rectangle waveform pulse voltage with high frequency. The frequency, amplitude and duty ratio were adjustable. The output capacity could reach to 50kW. The result showed that the device could be controlled speedily and easily. It could meet the requirement of liquid food process and without pollution. 