Provided is a left atrial appendage occluder, including a closure disc, a bracket located on one side of the distal end of the closure disc, and a connecting member connecting the closure disc and the bracket. The bracket includes a frame structure； the frame structure includes a proximal-end side face and a support circumferential surface connected to the proximal-end side face and extending from the proximal-end side face to the distal end. The connecting member is connected to the proximal-end side face. In the left atrial appendage occluder, the bracket is arranged such that one end having at least two support rods is closed, and the other end has an open structure, thus ensuring adequate supporting force for the bracket； at the same time, the support rods have a certain degree of independence with respect to each other.
