The invention provides a three-level multi-module inverter current-sharing control method and device. According to the three-level multi-module inverter current-sharing control method and device, thethree-phase grid-connected current of each module of an inverter under an operating state is acquired in real time; the three-phase grid-connected current is summated, so that a zero-sequence circulating component is obtained; the zero-sequence circulating component is compared with 0, and a first voltage command value is obtained by means of no-difference control; and switch driving signals are obtained according to the first voltage command value, so that current-sharing control can be performed. With the three-level multi-module inverter current-sharing control method and device of the invention adopted, the influence of the zero-sequence current component on the inverter can be avoided, and the uneven current of the inverter can be suppressed. The method of the invention is simple, easy to implement and highly practical.