The invention relates to a vaginal secretion fetching/medicating cannula device for female children and adolescents. The secretion fetching/medicating cannula device comprises a suction tube and a negative-pressure device. Suction holes are formed in the far end and sidewalls of the suction tube; a metal guide wire clings to the inner wall of the suction tube; the negative-pressure device comprises a drum body, a piston and a drawing rod; a connecting port is formed in the far end of the drum body; and the connecting port is connected to the suction tube. The vaginal secretion fetching/medicating cannula device disclosed by the invention has the following advantages: 1) the cannula device, when used for fetching vaginal secretions, is controllable in length, and the vaginal secretions are prevented from being contaminated by external environment, so that working difficulty of medical personnel is reduced and injuries are avoided; and the cannula device, which is good in controllability, can be used for as a special medical apparatus for fetching the vaginal secretions from the female children and adolescents; and 2) the cannula device, when conducting vaginal and vulvar administration, can precisely control administration positions, and meanwhile, by virtue of a threaded structure on the drum body, the cannula device is capable of completing drug loading and administration precisely; therefore, the cannula device has a broad application prospect in the clinical field.