Abstract: Aiming at the problems of large signal transmission loss, weak anti-interference ability and measurement and control lag in traditional measurement and control methods of transformer, it is difficult to meet the requirements of smart grid for real-time and high precision. Therefore, a digital measurement and control method of intelligent ring main unit transformer is proposed. High precision ADC, first-order high pass filtering and amplitude correction model are used to realize signal acquisition. UDP protocol, ARQ error control and EMC measures are optimized to ensure transmission. Intelligent algorithm based on fuzzy comprehensive evaluation is used to complete state measurement and control. Experiments were carried out on MATLAB/Simulink and RT-LAB platforms. The results show that compared with the method based on impedance control, the signal acquisition error of this method is reduced to ±0.8%~±2.0%, the transmission delay is reduced to less than 5 ms, and the stability time under impact load is only 20 ms, which can effectively ensure the stable operation of intelligent ring main unit and provide technical support for the intelligent upgrading of distribution network.