Method and device for controlling freeze thawing machine and freeze thawing machine

The invention relates to the technical field of biological freezing, and discloses a method for controlling a freezing and thawing machine, which comprises the following steps: when the freezing and thawing machine controls the temperature, detecting the duty ratio of an electric heater; and when the duty ratio of the electric heater is out of the set range, the operation frequency of a compressor of the two-stage cascade refrigeration system is adjusted until the duty ratio of the electric heater is within the set range. In the temperature control process of the freezing and thawing machine, the operation frequency of the compressor is adjusted, so that the power of the electric heater is within a reasonable range, and the temperature control energy consumption of the freezing and thawing machine is reduced while the temperature of the freezing and thawing machine is controlled. The invention further discloses a device for controlling the freeze thawing machine and the freeze thawing machine. 本申请涉及生物冷冻技术领域，公