Abstract: A non-mingling multicoloring pen comprising a barrel, ink reserooirs, a combined tip comprising a nib guard tube, two or more elastic nibs with ink tight surfaces fixed separatedly from each other in the nib guard tube by means of a nib position fixing means with the front ends of all nibs sticking out of the front end of the said nib guard tube, and the rear ends of the nibs being inserted into the front ends of the said ink reservoirs, a movable nib holder with a conical bore being mounted axially movably on the front end of the nib guard tube, and sheathing the front ends of the nibs. When the ink pen is in use, the nib holder forces the nibs to close up with each other to give various single color or mixed color lines, when the ink pen is not in use, the nibs of the ink pen can be released loose to restore its original separated state, thereby the color mingling is prevented.