The invention provides a heat-dissipating tube set with two circular arc shaped channels. The heat-dissipating tube set comprises two heat-dissipating tubes. Each heat-dissipating tube comprises a base tube, and heat-dissipating fins which are positioned in the periphery of the base tube; the cross section of each base tube is circular arc shaped; the heat-dissipating fins comprise a first heat-dissipating fin and second heat-dissipating fins, wherein each first heat-dissipating fin outwards extends from a central point of the circular arc; the second heat-dissipating fins comprise a plurality of heat-dissipating fins which outwards extend from the plane where the circular arc of the circular arc shape is located, and a plurality of heat-dissipating fins which outwards extend from the first heat-dissipating fins; the second heat-dissipating fins which extend in the same direction are parallel to each other; the extended end parts of the first heat-dissipating fins and the second heat-dissipating fins form an isosceles triangle; a first liquid channel is arranged in each base tube; a second liquid channel which communicates with each first liquid channel is arranged in each first heat-dissipating fin; the two heat-dissipating tubes are integrally abutted through the plane where the bottom side of the circular arc shape is located. According to the heat-dissipating tube set with the two circular arc shaped channels, the structure of a heat dissipating device is optimized to maximize the heat exchange efficiency, so that the energy and space can be saved, and the purposes of environment protection and energy conservation can be achieved.