A disassemblable far infrared knee-and-foot warming device includes a bottom plate, a top plate, a front frame, a curved plate, a plurality of screws and an opening. By operating the screws, the bottom plate, the top plate, the front frame and the curved plate can be assembled or disassembled, and the curved plate is provided with a far infrared heating plate. Thereby, the far infrared heating plate generates far infrared thermal energy, and the warming device can be easily disassembled for saving costs related to packaging, storage and transportation, and can be easily reassembled for use.