A chalk socket is disclosed. A head cap (1), a holder (2) and a tail cap (6) are integrally connected in the stated order from head to tail. One or two bumps (7) are disposed on an inner wall of the holder (2), and the chalk socket (3) is mounted in the holder (2). External threads are formed on the periphery of a rotating rod (4). A rotating ring (12) is disposed circumferentially on a tail end of the rotating rod (4). An outer rack is disposed on the periphery of the rotating ring (12), and an inner toothed groove matching with the outer rack is formed in an inner wall of the tail cap (6). The rotating rod (4) is hollow, and internal threads or two or three internal thread blocks matching with external threads of a socket head (11) are provided on an inner wall of the rotating rod (4). The socket head (11) is screwed in the rotating rod (4). With the rotating ring (12) and a second groove(s), the rotating rod (4) and a rotating sleeve (5) are mounted in the holder (2) and the tail cap (6). The chalk socket enables convenient use of chalks; and material saving and environmental protection are achieved.