1. The dustproof cover design of the pencil sharpener can prevent pencil ash overflow and foreign matter from entering, and prevent students from touching the pencil sharpener by mistake;2. The open-cover protection structure authorized by the utility model patent can automatically cut off the power after the lid is opened, and primary school students can also use it with confidence;3. With the function of adjusting the thickness of three different nibs, it can meet a variety of writing needs.