The invention provides a detachable loop heat pipe which comprises an evaporation section, a condensation section and a heat insulation section, the heat insulation section comprises a steam heat insulation section and a liquid heat insulation section, fluid absorbs heat and evaporates in the evaporation section, enters the condensation section through the steam heat insulation section and then enters the evaporation section through the liquid heat insulation section after releasing heat in the condensation section, and the liquid heat insulation section is communicated with the liquid heat insulation section. The evaporation section, the condensation section and the heat insulation section are mutually independent parts, two end parts of the evaporation section are respectively connected with one end of the steam heat insulation section and one end of the liquid heat insulation section through detachable parts, and two end parts of the condensation section are respectively connected with the other end of the steam heat insulation section and the other end of the liquid heat insulation section through detachable parts. Therefore, the evaporation section, the condensation section and the heat insulation section form a loop heat pipe. According to the loop heat pipe, an existing loop heat pipe is improved, the detachable components are arranged to be connected with the evaporation section, the condensation section and the heat insulation section, so that all the components are rapidly detached and replaced, the requirements of different heat exchange occasions are met, the system structure is simple, and the cost is saved.