Structure for accurately measuring drainage liquid amount

The utility model relates to the technical field of medical instruments. The utility model relates to a structure for accurately measuring drainage liquid amount. The drainage device comprises a drainage tube, one end of the drainage tube is implanted into a position needing drainage in a human body, a first control valve is connected to the outer side surface of the end, located outside the humanbody, of the drainage tube, a connecting mechanism is connected to the end, located outside the human body, of the drainage tube, and a connecting pipeline is hermetically connected to the bottom ofthe connecting mechanism. The drainage outlet is connected to the bottom of the drainage device in a penetrating mode. The drainage device is connected with an injector through the drainage outlet; aninjector with a proper specification is directly connected with a drainage outlet at the bottom of the drainage device; drainage liquid is directly extracted through the injector, splashing is reduced, infection is avoided, th