Abstract: A radio-frequency ablation electrode device with double-layered umbrella-shaped probes. The ablation electrode device comprises a temperature measuring tube (7) and a sleeve (5) sleeved outside of the temperature measuring tube (7). The head of the temperature measuring tube (7) is fixed to a first set of umbrella-shaped probes (8) in a welding mode, and a first fastening pipe (10) is fastened to the first set of probes (8) in a welding mode. The outside of the rear portion of the first set of probes (8) is coated with an insulating material layer, the outside of the insulating material layer is fixedly connected with a second set of umbrella-shaped probes (9), and a second fastening pipe (11) is fastened to the second set of probes (9) in a welding mode. The first set of probes (8), the human body and the second set of probes (9) form a radio-frequency current circuit.