The utility model discloses a fistula probe which is characterized in that the tail of the probe is provided with a pinhole, and a silk thread or a rubber band can be directly led into the pinhole for a seton treatment or a drag-line treatment. Operation is simple. In addition, the head of the fistula probe is in a ball shape and is made of pure silver, has a small diameter and good viscosity, facilitates probing various fistulas, and is safe and non-invasive.