The invention relates to a heat dissipation structure of power battery packs for a hybrid power vehicle, comprising the power battery packs, inlet ring-shaped deflectors, T-shaped deflectors, rhombic deflectors, air outlet deflectors, support plates and insulating bearing and fixing frames. The invention is characterized in that battery modules in the upstream positions of the air flow direction are arranged in regular rows and columns in parallel; battery modules in the downstream air outlet positions are arranged in parallel in a staggered manner; anodes and cathodes of the power batteries are fixed on the insulating bearing and fixing frames; and the support plates serve as supports among the power battery packs. By the heat dissipation structure, the cold air enters into the battery modules from the inlet ring-shaped deflectors through suction, the heat emitted in the working process of the batteries is taken away through heat exchange and the hot air at the air outlet is discharged by the deflectors, thus finally realizing cooling effect. The heat dissipation structure can ensure uniform heat dissipation of each battery module, is convenient in battery installation, simple instructure and low in manufacturing cost, and is suitable for the cylindrical power battery packs.