In the rewinding equipment, the cone-shaped base paper chuck used in the base paper rack of the corrugated cardboard production line has the disadvantage of breaking the base paper core and inner edge paper during use, which makes it difficult to use the tail paper and the tail paper is scrapped. The rate exceeds two per thousand. The automatic expansion type base paper chuck does not require power assistance. After the paper is successfully threaded, the chuck sliding plate will automatically expand and expand in the base paper core with the gravity rotation of the base paper to support the paper core or automatically contract to remove the paper core, which completely solves the problem of cone The shape-shaped base paper chuck breaks the disadvantages of the tail paper and improves the utilization rate of base paper.