Self-expanding vena cava filter

The utility model provides a self-expanding vena cava filter. According to a filtering capture section, on the basis of a closed annular structure, six V-shaped rods are extended out in parallel, the filtering capture section is equally divided by the V-shaped rods and rotates, the branch ends of the V-shaped rods are connected with supporting pillars of a supporting section to form a net structure with a tapered surface, branches at the tail ends of the V-shaped rods of the filtering capture section are mutually connected and intersected and the six parallel supporting pillars are extended out of the tail ends of the V-shaped rods of the filtering capture section, and thus the supporting section is formed. Spinous protrusions with the same number as the supporting pillars are arranged between the filtering capture section and the supporting section to form a anti-shifting section, a pre-filtering section is located at the other end of the supporting section, and the structures of the pre-filtering section and the filtering capture section are symmetric. Due to the fact that self-expanding memory alloy material is adopted, the self-expanding vena cava filter is convenient to operate in a interventional therapy process, and convenient to release and recover, the operation time is saved, the bleeding amount is reduced, the pain of patients is relieved, and the self-expanding vena cava filter brings convenience to an operator. In the implantation period of the filter, the supporting section is attached to the wall of blood vessels, and functions together with the anti-shifting section, the conditions including shifting, drifting and skewing and the like of an implant can be effectively avoided.