Abstract: In order to solve the problem of current distortion of the modular multilevel converter (MMC), this paper proposes the deadbeat control strategy for the medium voltage MMC. In each control period, the strategy calculates the number of on-off sub-modules according to the difference between the actual and reference AC current, so the MMC can increase its switching frequency with low switching times. At the same time, the proposed strategy needs no proportional integral (PI) control and fewer times of coordinate transformation, so it has the faster speed of calculation.