A balloon dilatation catheter with an anti-twist outer tube is formed by connecting a handle (1), a hypotube (2), an outer tube (3), a balloon (4), and a balloon tip (5) in turn. An inner tube (6), connected to the outer tube (3) and the balloon tip (5), is disposed in the balloon (4). A guide wire inlet (31) is provided on a side wall of the outer tube (3). An enhanced outer tube (32) is disposed at a tube wall layer of the outer tube (3) from a connection end of the hypotube (2) to the guide wire inlet (31). During an operation, the balloon dilatation catheter is pushed on along a guide wire, and is rotated from time to time to achieve the purpose of being pushed on and passing a narrow portion smoothly. The directional enhancement is disposed at the tube wall layer from the connection end of the hypotube (2) to the guide wire inlet (31), thereby enhancing the anti-twist capability of this segment of the outer tube, assisting in increasing the support force in the process of pushing on, reducing the twist phenomenon of a part of the outer tube exposed out of the guide wire, effectively improving the passing ability, tracking ability, and threading ability of the balloon dilatation catheter, and ensuring the success of the operation.Linvention concerne un cathéter de dilatation à ballonnet avec un tube extérieur anti-torsion, qui est formé en reliant un manche (1), un hypotube (2), un tube extérieur (3), un ballonnet (4) et une extrémité de ballonnet (5) lun après lautre. Un tube intérieur (6), relié au tube extérieur (3) et à lextrémité de ballonnet (5), est disposé dans le ballonnet (4). Une entrée de fil-guide (31) se situe sur une paroi latérale du tube extérieur (3). Un tube extérieur amélioré (32) est disposé au niveau dune couche de paroi de tube du tube extérieur (3) dune extrémité de liaison de lhypotube (2) à lentrée de fil-guide (31). Pendant une opération, le cathéter de dilatation à ballonnet est poussé le long dun fil-guide, et pivoté de temps en temp
