Anti-backflow remaining needle with filter

The invention relates to the field of medical treatment, in particular to an anti-backflow indwelling needle with a filter, which comprises an indwelling needle body, the indwelling needle body comprises a catheter, the catheter is used for being indwelled in a human body, an inner needle is arranged in the catheter and used for puncturing the human body, a tube seat is arranged at the tail end of the catheter, and the filter is arranged in the tube seat. A needle tail is inserted into the tube base, the side branch tube is connected with the extension tube, a non-return mechanism is arranged on the side branch tube and used for preventing blood backflow, a locking mechanism is arranged on the non-return mechanism and used for locking the clamping mechanism, and a filtering mechanism is connected to the end of the extension tube and used for filtering blood. And the filtering mechanism is used for filtering impurities. Impurities and glass residues generated when an ampoule bottle is used can be filtered thro