The present invention relates to a mist injection device having an accelerated injection structure and a construction method utilizing the same, and more specifically, as a mist injection device configured to spray the mist to the outside, is made of a hollow structure and is provided with an air inlet and an outlet The injection tube body is formed on the outer surface and the outer mist injection nozzle for spraying the inlet hole and mist, is arranged in the center of the inside of the injection tube body, a conical acceleration guide unit to form an annular acceleration space inside the injection tube body, It is formed on one end of the acceleration guide unit and consists of an inner mist injection mechanism that sprays mist, effectively accelerating the introduced air in a structure that narrows in the direction of the outlet to maximize the spraying force of the mist, and the air pressure difference caused by the accelerated air By introducing additional air to the inlet hole, the injection force is simultaneously The exploded and discharged air forms a space separated from inside and outside by the structure of the accelerator guide unit, so that mists having different purposes and effects are sprayed together inside and outside, respectively. The effect of reducing and blocking the temperature is excellent. In addition, the present invention is a construction capable of effectively reducing and blocking contaminants without seasonal restrictions such as freezing by spraying and spraying the mist protected by the air layer through the direct induction pipe while maintaining the induction pipe to such a mist injection device. As a method, a design process for mist transfer efficiency for determining the installation position of the mist injection device and the induction pipe, the diameter and length of the induction pipe and the number and location of the branch pipes, and the inclination angle of the induction wing of each branch pipe, etc. ； A branch indu
