The utility model provides a detachable electric tracing heat preservation box, it mainly by the detachable heat preservation of HALF shape box has integral type structure that the hot subassembly of companion of independent electric tracing function was assembled, one set of thermal equipment's the hot heat preservation of companion is constituteed to the detachable box that keeps warm of two its characterized in that of or polylith HALF shape, HALF shape detachable keeps warm the box by outside stainless steel shell, inside insulation material and install externally the quick hasp that stainless steel shell connects on the side and constitute, the hot subassembly of companion connected by armor electric heating wire, cold junction and the cold junction power cord is constituteed to it has independent power supply joint to meet to having on the cold junction power cord, it has simple structure, uses simple to operate, and characteristics such as electric tracing function can be realized to easy management and control, the easy maintenance.