Disposable sterile adapter

The utility model discloses a disposable sterile adapter substitute, and relates to the technical field of medical instruments. The connecting device comprises a conversion head, a connecting hose and a pagoda-shaped connector, the bottom of the conversion head is fixedly connected with the upper end of the connecting hose, the top of the pagoda-shaped connector is fixedly connected with the lower end of the connecting hose, and a Robert clamp is further arranged at the position, close to the conversion head, of the connecting hose in a sleeved mode. The position, close to the pagoda-shaped connector, of the lower portion of the connecting hose is further sleeved with a connecting piece, the connecting piece comprises a middle piece, a fixed arm, a movable arm and a spring, the lower end of the fixed arm is fixedly connected to the top of the middle piece, the upper end of the movable arm extends into the middle piece, and the upper end of the movable arm is elastically connected with the middle piece through