The utility model relates to an outdoor cabinet heat dissipation system based on low-power centrifugal fans. The outdoor cabinet heat dissipation system comprises an equipment cabinet, a plurality of sets of centrifugal fans are disposed in the equipment cabinet, and ventilating openings of the centrifugal fans are provided with baffle plates. Preferably, the top cover of the equipment cabinet is of a double-layer housing structure and comprises an internal layer top board and an external layer top cover, the centrifugal fans are fixedly disposed on the internal layer top board, and the ventilating openings of the centrifugal fans are positioned between the internal layer top board and the external layer top cover. The outdoor cabinet heat dissipation system based on the low-power centrifugal fans is convenient in installation, excellent in heat dissipation performance, relatively low in cost and reliable in operation, the problem that a traditional outdoor cabinet axial-flow fan air cooling system is insufficient in heat dissipation is solved, and the disadvantages that an air conditioner and a heat exchange system are complex in installation and relatively high in cost are prevented.