An improved left atrial appendage (LAA) occluder is provided. The improved LAA occluder includes a sealing disc and an anchoring device, both of which are mutually connected, At least two flow blocking membranes are arranged in the sealing disc. A part, cooperating with an LAA, of the anchoring device is an anchoring net, and the anchoring net is of a backboneless structure. The whole anchoring device is of the backboneless structure. The anchoring device is formed by weaving metal wires, a distal end of the anchoring device is opened, a proximal end of the anchoring device is constricted and is connected with the sealing disc to form a conical net, the distal end of the anchoring device is opened and is rolled towards the proximal end to form the anchoring net, and the anchoring net surrounds the conical net.