Cryosurgery device capable of achieving freezing and rewarming by adjusting gas pressure

The present invention discloses a cryosurgery device capable of achieving freezing and rewarming by adjusting gas pressure. The cryosurgery device comprises a high-pressure gas source, a high-pressure pressure-limiting valve, a freezing gas main pipe and a freezer for throttling and freezing; high-pressure gas divided from a high-pressure gas pipe passes through a shunting electromagnetic valve and a low-pressure pressure-limiting valve for pressure limiting, and is transmitted to the freezer via a heating gas main pipe for shunting and rewarming; gas from a low-pressure gas source passes through a low-pressure electromagnetic valve and the low-pressure pressure-limiting valve for pressure limiting, and is transmitted to the freezer via the heating gas main pipe for low-pressure rewarming; and the heating gas main pipe is provided with a gas heater capable of preheating low-pressure rewarming gas and achieving a controllable heating function. The technical prejudice that throttling refrigeration type gas can only be used for freezing is corrected, warming is performed by utilization of residual gas of high-pressure freezing gas and low-pressure gas, the rewarming problem and low-temperature working medium waste problem of a gas throttling type cryosurgery device are solved, and freezing, rewarming and heating functions are achieved.