The invention provides a method for amplifying and displaying a menu font of a set top box of a digital television, which is characterized by comprising the following steps of: acquiring a character string of the font to the amplified; calculating the line number and column number of a new dot matrix according to the amplification multiple by extracting the line number and column number of the dot matrix of each character of the character string; and calling an OSD module function to dot and fill color for the line number and column number of the new dot matrix so as to amplify the character. The method can conveniently realize the function of amplifying and displaying the menu font of the set top box, a plurality of sets of font libraries are not needed to be designed and stored in the space of a flash memory FLASH. Therefore, the space of the flash memory FLASH is reduced.