A medical catheter flow-stopping clip, especially a balloon-type positive pressure cut-off switch for a medical catheter, comprises a body and a catheter through hole arranged on the body and used for allowing the medical catheter to pass through. A key point thereof is that the medical catheter flow-stopping clip also comprises a movable lock rod. The body is a lock rod lock sleeve. A lock convex block and a falling-prevention convex block that can elastically stretch horizontally are arranged at an interval in a longitudinal direction of the movable lock rod. Both the lock convex block and the falling-prevention convex block are a check pawl. The moveable lock rod is inserted into a cavity of the lock rod lock sleeve. A longitudinal section of the moveable lock rod is sleeved in the lock rod lock sleeve. The bottom of the moveable lock rod is inserted into the catheter through hole, and clamps the medical catheter to a clamping surface at a bottom side of the catheter through hole when the lock convex block is in contact with the lock rod lock sleeve. An outer peripheral surface of the medical catheter is coated with an elastic balloon. The present invention has the characteristics: operations are simple, negative pressure will not occur and the medical catheter does not need to be pulled during an operation process, and an operation accident caused by pulling of the medical catheter will not occur.Linvention a pour objet une pince darrêt découlement pour cathéter à usage médical et plus concrètement un commutateur darrêt avec pression positive de type à ballonnet pour cathéter à usage médical, lequel comprend un corps et des orifices traversants pratiqués sur le corps et utilisés par le cathéter médical. Linvention comprend avantageusement une barre de blocage mobile, dont le corps constitue une tige de blocage et qui présente, à intervalles prédéfinis sur la longueur, une protubérance de blocage et une protubérance de butée-arrêt, toutes deux tenant lieu de cliq
