The epicardium ablation system comprises an ablation catheter and an ablation electrode catheter, the ablation catheter comprises a balloon, an adjustable bending structure, an endoscope, a guide wire channel, an ablation electrode channel and a guide wire, the endoscope is connected with an electrode controller, one end of the ablation catheter is connected with a handle, and a knob and a push button are arranged in the middle of one end of the handle. The knob is connected with the adjustable bending structure through a pull wire, a positioning assembly is arranged on the handle and located between the knob and the push button, one end of the knob is sleeved outside the handle and sleeved with a positioning ring, and the positioning assembly is connected with the positioning ring in a matched mode. The ablation catheter handle structure has the advantages that the front end is kept in the current bending state, the locking state can be relieved in time through the reverse positioning assembly, and a doctor can operate with one hand under the condition that precision and stroke are controlled.