Ultra-fine tumor cryoablation probe with expansion balloon

The utility model relates to an ultra-fine tumor cryoablation probe with an expansion balloon. The ultra-fine tumor cryoablation probe comprises a shell, the balloon, a film thermocouple and an insulating layer, the shell is composed of a targeting region and a non-targeting region which are integrated, the balloon is fixed in the non-targeting region, an inflation hole of the expansion balloon is formed in the tail end of the non-targeting region, the outer wall of the targeting region is coated with the film thermocouple, and the insulating layer is arranged between the shell and the film thermocouple in a coating mode. The ultra-fine tumor cryoablation probe has the advantages that puncturing is easy and smooth, a little injury to normal tissue is caused, the complication occurrence rate is low, normal tissue of the non-targeting region is protected, and temperatures of multiple positions of the targeting region are measured in real time. The ultra-fine tumor cryoablation probe is suitable for tumor cryoablation of special parts nearby lungs, brains and great vessels.