Thrombus preventive indwelling needle not blocking needle tubing

The invention discloses a thrombus preventive indwelling needle not blocking a needle tubing. The indwelling needle comprises a three way needle stand, an indwelling hose arranged in the front end ofthe three way needle stand and a puncture needle penetrating into the indwelling hose from the three way needle stand; a plugging structure is arranged in the three way needle stand; after once transfusion, the plugging structure penetrates into the front end of the indwelling hose to plug a front opening of the indwelling hose; and in the transfusion process, the plugging structure is withdrawn into the three way needle stand behind the indwelling hose to not influence the flow velocity of transfusion. Compared with a present positive pressure joint type or counter current preventive product,the indwelling needle prevents blood backflow in an accurate position, a blood clotting phenomenon is avoided, the thrombus preventive effect is good, and the indwelling needle has significant influence on clinical operation,