The invention provides a carbon belt box. The carbon belt box comprises a scroll supplying shaft, the carbon belt winds around the scroll supplying shaft; a scroll receiving shaft, the scroll receiving shaft is used for receiving the carbon belt outputted by the scroll supplying shaft, rotation limiting parts are respectively arranged on the scroll supplying shaft and the scroll receiving shaft; an outer housing, the scroll supplying shaft and the scroll receiving shaft are rotatably arranged in the outer housing; an elastic joint component, the elastic joint component is jointed with or separated from the rotation limiting part of the scroll supplying shaft and the rotation limiting part of the scroll receiving shaft; the elastic joint component can be elastically deformed in the axis direction of the scroll supplying shaft and in the axis direction of the scroll receiving shaft; the elastic joint component comprises a contact part, the contact part is matched with a printer main body; the contact part bends in the direction of the jointing with the rotation limiting parts. The contact part of the elastic joint component bends in the direction of the jointing limiting with the scroll supplying shaft or the scroll receiving shaft, the problem that the elastic joint component deforms in the direction of breaking away from rotation limiting under pressure can be solved.