The utility model relates to a combined structure for multi-level voltage source current converter valve towers, and particularly relates to a modularized multi-level voltage source current converter with a multi-connected group tower structure. The modularized multi-level current converter is composed of three phases of six bridge-arms. Each bridge-arm is composed of multi-connected group towers which are composed of at least two-connected valve towers. The at least two-connected valve towers are connected via a common supporting member. Each valve tower is composed of at least two layers of module units which are vertically arranged and distributed in a back-to-back way. The multi-connected tower structure is adopted and is expanded along the direction of plane so that space occupation and construction cost of the current converter can be reduced, design, manufacturing, installation and expansion of the current converter equipment are facilitated, and a flexible selection scheme is provided for design of a valve hall.