The paper introduces an automatic freezing and saving device in the water triple point cell for CIMM-TH-0230.The reproducibility of the temperature plateau in the water triple point cell is studied with the device,and the performance of the device is evaluated.The test results show that: the change in the temperature plateau of the triple point of water with the freezing device is not more than 0.2 mK within 48 h;the reproducibility is less than 0.06 mK; the repeatability is better than 0.5 mK;the temperature differences between different cells are not more than 0.4 mK. According to the test results,the device is suitable for freezing,saving and reproducing of the water triple point cell.