A heat radiator comprising a heat dissipation plate, where a plurality of circumferentially disposed heat dissipation regions are disposed on the heat radiator, a plurality of first heat dissipation fins disposed in parallel with each other are disposed at intervals in each heat dissipation region, a heat dissipation channel is formed between adjacent first heat dissipation fins, one end that is of the heat dissipation channel and that is away from a center of the heat dissipation plate is an air inlet, and a direction that is above the heat dissipation channel and that is towards a hollow region is an air outlet.