The invention discloses a heat radiation structure of twisting cables of a wind generating set. The heat radiation structure of twisting cables of a wind generating set includes a cable harness and a plurality of supporting rings, wherein the cable harness stretches to the inside of a tower tube from a cabin of a wind generating set; the plurality of supporting rings are arranged on cables in the cable harness in the axial direction at intervals, and separate the adjacent cables so as to form a heat radiation space in the cable harness. By setting the supporting rings on the cables, the heat radiation structure of twisting cables of a wind generating set utilizes the supporting rings to separate the adjacent cables so as to guarantee that the cables in the cable harness can have enough heat radiation space and setting of the supporting rings on the cables has little influence on twisting of the cable harness. The heat radiation structure of twisting cables of a wind generating set has the advantages of being simple in structure, being reasonable in design, being safe and reliable, being conductive to heat radiation and twisting of twisting cables of the wind generating set, being conductive to reduction of the cost and the installation difficulty of the cables, being high in practicality, and being substantial in economic benefits.