The present utility model provides a cutter sharpener including a housing, a height adjusting mechanism and a cutter clamping mechanism mounted on the housing, and a grinding mechanism rotatably connected to the height adjusting mechanism. The housing includes a first mounting location, the height adjusting mechanism is movably connected to the first mounting location, the height adjusting mechanism includes a lifting body, and the lifting body can move up and down relative to the first mounting location. The cutter sharpener further includes a degree indicating mechanism fixedly connected to the lifting body.