The invention relates to a weaving method of a thermal fabric. The thermal fabric is characterized by comprising a back fabric good in reflection as an outer layer and a front fabric poor in reflection as an inner layer, and a thermal layer located between the back and front fabrics. The thermal layer comprises inner layer fabrics and outer layer fabrics, and bonding parts arranged between the inner layer fabrics and the outer layer fabrics at an interval in parallel. The inner layer fabrics and the outer layer fabrics are bonded together at the bonding parts, and filling spaces are formed between the inner layer fabric and the outer layer fabric of adjacent bonding parts. According to the weaving method of a thermal fabric, a thermal layer is arranged between the back and front fabrics and is provided with filling spaces without heat dissipation pipes, so that the thermal fabric is good in thermal insulation properties.