The utility model provides a heat radiating device used for semi-conductor laser monotube combined profile pumping solid laser, which comprises an upper heat sink, a lower heat sink, a thermoelectric cooler piece and a radiator. The bottom surface of the upper heat sink is connected with the top surface of the lower heat sink; the thermoelectric cooler piece is clamped between the lower heat sink and the radiator, and the cold surface of the thermoelectric cooler piece is attached to the bottom surface of the lower heat sink while the hot surface is attached with the top surface of the radiator, wherein corresponding positions of the bottom surface of the upper heat sink and the top surface of the lower heat sink are respectively provided with an axial through hole, the radial direction cross sections of the two axial through holes take the shape of an equilateral polygon; the bottom end of the axial through hole of the lower heat sink is provided with a bulge on which a groove is arranged; the surface of the upper heat sink and the interior of the lower heat sink are provided with heat pipes used for conducting heat. The heat radiating device can realize full air cooling of the high-power semi-conductor profile pumping solid laser gaining module, is specially applicable to the obtaining of high-power laser in a narrow space; and the heat radiating device has the advantages of simple structure, high heat radiating efficiency and convenient use.