The invention discloses a low-voltage high-current three-phase driving power module group structure. In the structure, a plurality of single-tube power devices which are arranged in a staggered way, a connecting copper bar which is used for connecting each single tube in series and is arranged on the output alternating-current side of a power module group, a bar-shaped convergence bridge of a connecting copper bar which is connected in parallel with the cathode of a battery, a bar-shaped convergence bridge of a connecting copper bar which is connected in parallel the anode of the battery, a connecting copper bar on a power output lead-out and adoption alternating-current side, and mechanical design between various connecting copper bars and a shell wiring post are meshed (clamped); and the power module group is supported by a connecting copper bar. According to the structure, the shock resistance and stability of the power module group are improved; and the structure is compact and has high radiating performance.