A portable thermoshapable fabric composite heating device kit mainly comprises a portable heating device and a thermoshapable fabric composite; wherein the portable heating device includes a first box body and a second box body disposed above or inside the first box body. A heating space formed between the bottoms of the two box body bodies is used to accommodate a heating pack. The thermoshapable fabric composite can be accommodated within a receiving space of the second box body. After water is added into the first box body to flood the heating pack, and a lid is placed to cover the top, the heat-generating material in the heating pack contacts the water to generate water vapor during an exothermic reaction. The water vapor enters the receiving space, in which the thermoshapable fabric composite is stored, through the multiple pores at the bottom of the second box body. The generated thermal energy will heat the thermoshapable fabric composite without the need for open flame or electricity. That is, the thermoshapable fabric composite can be heated and softened, so that the thermoshapable fabric composite can be used in the field without reliance on external elements, such as conventional heating or electricity, in order to achieve the purpose of providing first aid such as bandaging and fixation, and to prevent secondary injuries.