Automatic sliver-can changing system of carding machine

The utility model relates to an automatic sliver-can changing system of a carding machine, which belongs to the technical field of the textile machine, and comprises a carding machine (1), a cotton sliver threading device (2) and a cotton sliver can (3), wherein the cotton sliver can (3) is arranged below the cotton sliver threading device (2) of the carding machine (1), and is characterized by also comprising a sliver-can changing device (4), wherein the sliver-can changing device (4) is arranged in the feeding direction of the cotton sliver can (3) and is vertical to the cotton sliver threading device (2), the sliver-can changing device (4) comprises an air cylinder (4.1), a jacking bar (4.2) and a trolley (4.3), the air cylinder (4.1) is horizontally arranged, one end of the air cylinder (4.1) is fixed on the floor, the other end is provided with the jacking bar (4.2), the jacking bar (4.2) presents in an arc shape which is consistent with the arc of the outer wall of the cotton sliver can (3), two ends of