The invention discloses an ISOP grid-connected inverter combination system and a target multiple control method therefor, and belongs to the field of a direct current-alternating current converter of an electric energy conversion apparatus. The ISOP grid-connected inverter combination system comprises n standard inverter modules; the modules are connected in series at the input end and are connected in parallel at the output end, and then are connected to a power grid; and two objects of inter-module power balance and high-power factor grid connection are required to be implemented. The topological structure of the ISOP grid-connected inverter combination system is optimized; the output voltage of each module bridge arm passes through an inverter side inductor L and is filtered by a filtering capacitor C to be connected in parallel at the two ends of the capacitor; next, the output voltage is subjected to grid connection through a public grid-side inductor L2; and in addition, the inductance value of the required inductor L2 at the moment is greatly reduced compared with that of a single-module grid-connected inverter, so that the topology is simplified and the system volume is reduced. The invention also provides a power balance policy when the ISOP grid-connected inverter combination system is applied to a grid-connection application occasion, and control policies for each module, so that multiple target control under the premise of adopting minimum control amount is realized.