A multifunctional drainage bag conversion head, comprising a first assembly (1) and a second assembly (2) which are detachably connected in an inserted manner. The first assembly (1) comprises a first flow guide channel (13), and the second assembly (2) comprises a second flow guide channel (23)； the second assembly (2) is provided with a connector (211), the first assembly (1) is provided with an interface (121), the interface (121) and the connector (211) can be mutually inserted and communicated, and the connector (211) can further be used for connecting to a water filling nozzle of a urethral catheter； the second assembly (2) comprises an observation chamber (24), and the observation chamber (24) is defined by an outer wall that is transparent all around； the outer side of the second assembly (2) is provided with an air vent (221), the air vent (221) is provided with a one-way valve, and the air vent (221) is located at one end of the second assembly (2). The multifunctional drainage bag conversion head is simple in structure, small in volume, and convenient in production and processing； moreover, when being used for a urination purpose, water in a balloon can be not only conveniently drained into a urine bag, it is also convenient for medical staff to determine the drainage of the balloon, thereby facilitating the removal of the urethral catheter.L'invention concerne une tête de conversion de sac de drainage multifonctionnelle, comprenant un premier ensemble (1) et un second ensemble (2) qui sont reliés de manière amovible et insérée. Le premier ensemble (1) comprend un premier canal de guidage d'écoulement (13), et le second ensemble (2) comprend un second canal de guidage d'écoulement (23) ； le second ensemble (2) est pourvu d'un raccord (211), le premier ensemble (1) est pourvu d'une interface (121), l'interface (121) et le raccord (211) peuvent être mutuellement insérés et mis en communication, et le raccord (211) peut en outre être utilisé pour le raccorde
