The invention relates to a carding machine which is provided with a plurality of drums (20,21,22 and so on) and a covering device, wherein the covering device (1) can form an encloser (E), and the drums of the carding machine is contained in the encloser. The covering device (1) is provided with at least a covering element (10, 11, 12, and 13), and the covering element is vertical to the vertical direction of the drums of the carding machine along a shaft line (MD) and can do translational motion between a covering position and an end portion opening position, the covering position exclusively belongs to the covering unit on the position, at least one portion of the drums of the carding machine is covered by the covering element, and the drums are not covered by the cover element on the end portion opening position.