Cover of chalk

The utility model discloses a novel chalk cover, which comprises an outer chalk cover tube and an inner core tube of a chalk tube, wherein, the inner core tube is arranged in the outer chalk cover tube; the front end of the inner core tube is tapered and is divided into valves; the inner core tube extends out of the outer chalk cover tube and is clamped by the tube port of the outer chalk cover tube. Chalk is arranged in the inner core tube; the front end of the chalk is clamped by a tapered mouth divided into valves. The chalk cover has the advantage of convenient use. The clamped length of the chalk can be freely regulated; chalk dust can not be fully stuck on the chalk cover.