The invention discloses an islanding protection and fault ride-through coordinated operation method suitable for a distributed inverter system. The islanding protection and fault ride-through coordinated operation method comprises the steps of: coordinating two control functions of islanding protection and fault ride-through of the distributed inverter system according to variations of voltage and frequency measurement values at a PCC; providing certain voltage/frequency support for a power distribution network through fault ride-through by the distributed inverter system preferentially when the power distribution network fails; supplying power to local loads continuously through short-term island operation by the distributed inverter system while the fault ride-through cannot be achieved and the condition of island operation is satisfied; and splitting the distributed inverter system from the power distribution network to stop power supply when all the conditions are not satisfied. The islanding protection and fault ride-through coordinated operation method can achieve benefit maximization of the power grid by adopting local renewable energy sources, greatly improves power supply reliability of the system while ensuring power supply safety, and is conductive to high-proportion grid connection of the distributed grid-connected inverter system based on the renewable energy sources in the power distribution network.