In order to obtain ideal output voltage and output current of the LCL three-phase grid inverter, and enhance the operation performance of the inverter, the paper proposed a dynamic sliding mode control strategy in current inner ring, based on the two-phase synchronous rotating d/q coordinate system mathematical model. The reference current for the current inner loop is provided by direct power control loop. In order to weaken the chattering phenomenon, the current inner use dynamic sliding mode control method. Finally the proposed control strategy is verified correct and reasonable with PSCAD software. The method guarantees the three-phase LCL grid inverter run in power factor, and has the reference value for application.