The utility model relates to a portable warmer which is composed of an external windproof cover, an internal windproof cover, a fuel container and a steam kettle, wherein the internal windproof cover is arranged in the external windproof cover and leaves certain invervals; the lower part of the external windproof cover and the upper part of the windproof cover are provided with air holes; the fuel container is arranged in the internal windproof cover. The upper end of the fuel container is provided with a loading and twining board on which a plurality of twining holes. Burning twine is arranged in the twining holes. The steam kettle is positioned on the upper end of the internal windproof cover. A steam outlet and a steam return inlet which extend over the external windproof cover are arranged on the steam kettle. The utility model is convenient for mounting or dismounting and is convenient for filling fuel. The utility model has the advantages that temperature rises rapidly; fuel filled for one time can be used for warming for a long time. The utility model is convenient for carrying and using in field operation, traveling or different rooms in one house. The utility model can operate normally under hostile environment such as open air, strong wind, heavy rain, etc.