The utility model discloses a kind of pen point thickness adjusting mechanism with gear display and pencil sharpener, wherein pen point thickness adjusting mechanism with gear display includes knob, display screen, gear adjusting rod and gear disc, one end of the gear adjusting rod is connected with the knob, the other end is used to trigger gear switch, the display screen is set on the surface of the knob, for showing the gear information of the gear switch, the gear adjusting rod is transmission connection with the gear disc, so that the gear disc is switched between different gear positions, and different gear positions correspond to different pen point thickness.The utility model provides a kind of pen point thickness adjusting mechanism with gear display, by integrating gear display on the display screen of knob surface, and combining internal structure to realize accurate adjustment and intelligent prompt to pen point thickness, improve the use convenience and sense of technology of product.