PURPOSE: A separate cage is provided to enable safe heat insulation without a fire risk by warming a bottom part or a wall part. CONSTITUTION: A separate cage comprises: a main body(10) with a bottom part and a wall part forming a space for animals, a main entrance at one side or both sides; a fastener which integrates and fixes the bottom part at the wall part by assembling the same; a heater which provides heat to the inside of the main body and maintains a warm space; and a controller(40) which supplies power to the heater and controls the operation of the heater.
