An indwelling needle having sustained release positive pressure, comprising an indwelling needle component, a double lumen catheter (3), a catheter clamp (4), a Y-shaped positive pressure connector (5), and a solution reservoir (6). The indwelling needle component comprises a needle sheath (7), a catheter component (1), and a needle component (2). The catheter clamp (4) is sleeved on the double lumen catheter (3). The double lumen catheter (3) is firmly connected at either extremity respectively to a Y-shaped oblique interface of the catheter component (1) of the indwelling needle component and to a lower extremity interface of a connector base (54) of the Y-shaped positive pressure connector (5). The solution reservoir (6) is screwed onto an oblique interface of the Y-shaped positive pressure connector (5). This is characterized in that: the double lumen catheter (3) is a double lumen catheter having a large lumen and a small lumen, where the large lumen (31) is a regular infusion channel and the small lumen (32) is a tiny aperture. While indwelling, when the catheter at the large lumen (31) is clamped shut by the catheter clamp (4), hydraulic pressure released by the positive pressure connector (5) and the solution reservoir (6) forms a pressure, a medicinal solution slowly flows out from the small lumen (32) and permeates into a blood vessel, thus preventing thrombus formation. The indwelling needle has an extended service life, obviates instruments consumed for catheter sealing, and reduces medical expenses.Cette aiguille à demeure à libération prolongée et pression positive comprend un ensemble aiguille à demeure, un cathéter à double lumière (3), un support de cathéter (4), une tête à pression positive (5) en forme de Y et un réservoir (6), l'ensemble aiguille à demeure comportant une protection d'aiguille (7), un ensemble cathéter (1) et un ensemble aiguille (2), le support de cathéter (4) enveloppant le cathéter à double lumière (3) dont les deux extrémités
