Abstract: With the increasing demand for power quality in the power system, reactive power compensation can improve the power factor of the grid, reduce line loss, and improve voltage quality. Therefore, higher requirements are put forward for the economy, reliability, and accuracy of reactive power compensation devices. The groundbreaking application of intelligent criterion fusion control system in the "fully split phase reactive power compensation device" proposed in this article innovatively adopts the "124888" coding control logic to achieve "31 level" full split phase automatic compensation. In the compensation method, each phase can be compensated separately, thus achieving reactive power balance of any phase. And the effectiveness of the scheme was verified through an example, and the results verified that the device has the advantages of short response time and high compensation accuracy.