3D printing system and method for fonts on surface of cake

The invention relates to the field of cake processing, in particular to a 3D printing system and method for fonts on the surface of a cake. The line width of the fonts can be conveniently changed, so that the cake making efficiency is increased. The method comprises the following steps: s1, starting a power mechanism to drive a printing column to move in a printing sleeve in a reciprocating mode; s2, extruding a font material into the printing sleeve through a connecting pipe, so that the font material is pushed out to the surface of the cake through the printing column which slides out of the printing sleeve every time; and s3, connecting the font materials which are pushed out by the printing column during descending every time by moving a mounting frame, and printing the fonts on the surface of the cake. The system comprises the printing sleeve, the connecting pipe, the printing column, the mounting frame and the power mechanism, wherein the printing sleeve is arranged in the center of the mounting frame,