Abstract: Aiming at the problems of low heat resistance temperature, high hardness, and thickness of thermal insulation device for fire area blasting explosives, this paper studies the heat insulation principle of heat insulation device, and the types of thermal insulation material and the its advantages and disadvantages. That combined with the selection requirements of fire area insulation material, and then the structure of thermal insulation device is designed, and a charging process of heat insulation device is developed. The results show that thermal insulation device which composed of absorbing material, inorganic insulation material for the outer layer, organic material as the inner layer, coated with reflection paint and radiation paint has good insulation effect. Installed rubber emulsion explosive, the loading process, such as blasting operation process can meet the fire area of the status quo.