Harmonic interaction is one of the main disturbances affecting the normal operation of microgrid. The problems of harmonic resonance and harmonic circulation have attracted much attention. Circulating current suppression is the key technology to ensure the reliable operation of micro-grid system. In order to deal with the poor effect of circulating current suppression under the disturbance of double closed-loop PI control, a multi-inverter parallel circulating current suppression strategy based on active disturbance rejection control is proposed. The disturbance is estimated and feedback compensated by linear extended state observer, combining with the unique bandwidth method, the control effect of parallel current sharing of multiple inverters is improved. The main contents of this paper are as follows: the topology of inverter is established and the mathematical and physical mechanism of circulating current is analyzed. Through the MATLAB simulation of two inverters connected in parallel under the condition of grid connection, it is proved that under the condition of disturbance, the active disturbance rejection control has a good ability to suppress the circulating current, so that the system has a good dynamic response performance and current sharing effect, which improves the disturbance rejection ability and reliability of the parallel system.