The invention discloses a wind power generator unit heat-dissipating device and a wind power generator unit heat-dissipating method based on a separate heat pipe heat exchanger, and belongs to the technical field of wind power generator unit temperature control. The internal part of a cabin of the wind power generator unit is subjected to heat dissipation by the separate heat pipe heat exchanger and the internal structure of the original cabin is changed little, so that manufacturing and mounting are facilitated; and a heat pipe condensation section and a heat pipe evaporation section of the separate heat pipe heat exchanger can be arranged separately, the heat pipe evaporation section is arranged on a part, needing heat dissipation, in the cabin, the heat pipe condensation section is arranged at the top of the cabin, a medium in the heat pipe evaporation section is changed into a gaseous medium after absorbing heat, the gaseous medium flows to the heat pipe condensation section at thetop of the cabin through a vapor ascending pipe and exchanges heat with the external air to be condensed into a liquid medium, the liquid medium returns to the heat pipe evaporation section under thegravity action and through a liquid descending pipe, and continuous transfer of heat is completed by depending on continuous phase change of the interal medium. The wind power generator unit heat-dissipating device has high heat-dissipating efficiency, can effectively solve the heat dissipation problem of a rotating part and an electric appliance component in the cabin and has extremely high practical value.