The invention provides a structure and method for decreasing an inner-outer temperature difference of a wall of a low-temperature liquefied gas storage tank during a construction period. Prestressed corrugated pipes made of a thermal conductive material are pre-buried in the tank wall in the casting process. The two ends of the prestressed corrugated pipes are exposed out of the tank wall, and one ends of the prestressed corrugated pipes communicate with an air supply device. When heat is generated on concrete of the tank wall due to hydration, the air supply device feeds air-cooling air into the prestressed corrugated pipes, the air-cooling gas absorbs heat inside the tank wall and converts the heat into hot air to be discharged out of the tank wall, and the situation that the inner-outer temperature difference of the tank wall is excessively high and cracking is caused can be avoided.