The invention relates to the field of automobile wheels, in particular to a heat dissipation mechanism of a dual-tire wheel. The heat dissipation mechanism of the dual-tire wheel comprises an outer side wheel body and an inner side wheel body which are arranged side by side, and a plurality of spiral blades arranged in the circumferential direction are arranged on the inner side of a rim of the outer side wheel body. A plurality of flow guide mechanisms a arranged in the circumferential direction are arranged on spokes of the outer side wheel body. Each flow guide mechanism a comprises a heat dissipation hole a and an arc-shaped flow guide sheet a, the flow guide sheets a are fixed to the outer sides of the spokes of the outer side wheel body, and the heat dissipation holes a are formed in the inner sides of the flow guide sheets a. A plurality of flow guide mechanisms b arranged in the circumferential direction are arranged on spokes of the inner side wheel body. Each flow guide mechanism b comprises a heat dissipation hole b and an arc-shaped flow guide sheet b, the flow guide sheets b are fixed to the outer sides of the spokes of the inner side wheel body, and the heat dissipation holes b are formed in the inner sides of the flow guide sheets b. The flow guide sheets a and the flow guide sheets b are opposite in indent direction. The heat dissipation mechanism of the dual-tire wheel is safe and economical, and saves energy.