A method for manufacturing a luggage includes the steps: A) making a thermoplastic sheet into a shell, B) placing the shell body of the shell in an inner concave mold area of a heating mold and setting the shell edge of the shell to a frame mold area of the heating mold to correspond the outer surface of the shell to an inner wall surface of the heating mold, C) setting the outer surface of the thermoset carbon fiber plastic layer on the inner surface of the shell, D) setting the filling layer on the inner surface of the thermoset carbon fiber plastic layer within the frame mold area, E) expanding an air bag to the thermoset carbon fiber plastic layer and the filling layer and heating a heating mold, so that the shell, the thermoset carbon fiber plastic layer and the filling layer are combined with each other.