A carton box includes a main body and at least one fastening module removably mounted on the main body. The main body includes two first face boards and two second face boards. One of the first face boards is provided with a first movable plate. The other one of the first face boards is provided with a second movable plate. The main body is provided with at least one locking slot. The at least one fastening module includes a first fastener member mounted on the second movable plate and a second fastener member located in the at least one locking slot of the main body. The second fastener member is detachably connected with the first fastener member.