The invention relates to a method for producing puffed foods under normal temperature and high pressure, which comprises the following steps of: under normal temperature, injecting high pressure nitrogen gas of 1.2 MPa into a pressure container (1), stirring, staying for a certain period of time, instantaneously opening the pressure container (1), and quickly opening and closing a pressure valve (3) for pressure relief. Thus, foods quickly expand before the balance of great pressure difference caused by sudden pressure relief. The method can be used for keeping the original flavor and the nutrient contents of the foods.