The invention discloses a method for producing fully expanded whole-grain corn, comprising the following steps: (1) shelling the core, drying the picked raw waxy corn embryos, dipping in alkali liquid, taking outside and draining, washing, draining, starting a peeler, putting the corn which is drained to the peeler, washing the corn after being peeled, and dipping in acidic liquid for one night, wherein the concentration of the alkali liquid is 2%-9%, the pH value of the acidic liquid is 2-5; (2) boiling and drying the corn, taking the corn outside the acidic liquid, putting in water to boil for 1-2 hours, taking outsides, washing with clean water, flatly paving in a refrigerated storage at 2-4 degrees centigrade to age, and drying after being aged at constant temperature; and (3) frying,wrapping with powder, and packaging. The invention changes the traditional technology which is to firstly fry, then peel and expand, or firstly boil, then peel and fry; and the invention firstly peels, then pasting, and finally frying. The corn has beautiful appearance after being fried and expanded, has crisp taste, obviously improves the additional value of the process, and enlarges the consumer market.