The invention provides a method for further processing fiddleheads and fiddlehead-processed goods obtained by using the same, wherein the method comprises the following steps of: adding glutamic acid or sodium glutamate in the fiddleheads, and transforming the glutamic acid or the sodium glutamate into gamma-aminobutyric acid through enzyme inhering in the newly harvested fresh fiddleheads. The method has the advantages of simple production process and low equipment investment and is suitable for large-scale industrial production, and the obtained fiddlehead-processed goods have high content of the gamma-aminobutyric acid.