The invention discloses a chuck which comprises a substrate. The substrate is horizontally arranged; a through hole, which a screw passes through, is formed in the middle of the substrate; and hoops for fixing a handle of an umbrella body are respectively and fixedly arranged at two ends of the substrate. The chuck provided by the invention comprises the substrate and the hoops which are used for fixing the handle of the umbrella body and are arranged at the two ends of the substrate. When the chuck is used, the chuck is fixed at the top of a supporting frame through the screw, and then the handle of the umbrella body is inserted into the hoops, and lastly the chuck is tightened. The chuck is conveniently used.