A cold-circulation ablation needle system is characterized by comprising a needle point (1), a needle bar (2), a capillary (3), a thermocouple sensor lead (4), a heat shrink tube (5), a needle bar fixing seat (7), a handle casing (8), a water pipe fixing seat (1), a water outlet pipe (11), a water inlet pipe (12), an electrode contract (14), a radio frequency line (16) and a temperature compensation lead (17), wherein the needle point (1) is located at the front end of the needle bar (2), the back end of the needle bar (2) is connected with the needle bar fixing seat (7), and the needle bar (2) is sleeved with the heat shrink tube (5) and adopts a hollow structure. A cold sterile water circulation structure is adopted in an electrode of the cold-circulation ablation needle system, the highest energy deposition is obtained in an ablation area, impedance rising of surrounding tissue is effectively reduced, and carbonization is avoided.