The invention discloses a modularized multi-level converter bridge arm topology suitable for current source control. The modularized multi-level converter bridge arm topology comprises all phases of upper and lower bridge arm circuits with the same structure, wherein each bridge arm circuit consists of N sub modules of the same structure, N same power switch tubes and one bridge arm inductor whichare connected in series in sequence; the configuration quantity of the sub modules and the power switch tubes are the same; and the conduction direction of the sub modules is opposite to that of thepower switch tubes. The MMC bridge arm topological structure disclosed by the invention is simple in structure, easy to control, and easy to extend infinitely. By virtue of a switch control strategy,switching between a rectification and grid-connected inverter mode suitable for voltage source control and a rectification mode suitable for current source control is achieved; and meanwhile, the topology is high in practicability and reliability, and suitable for various applications of flexible direct current transmission.