Thermostat for testing liquid tension

The utility model provides a constant temperature machine for testing liquid tension. The utility model comprises a base, and a sample table and a constant temperature module on the base, which are movably provided with shafts, wherein, the sample table is made of heat conducting materials, and a sample socket is arranged on the sample table. The utility model is characterized in that the constant temperature module uses a plurality of cooling assemblies made of N-shaped and P-shaped semiconductor materials; the cold surface and the hot surface of the constant temperature module are attached and fixedly connected to the bottom surface of the sample socket; the positive and the negative power supply ends of the constant temperature module are correspondingly connected to a power supply through a temperature control transfer switch K. Because the sample table is provided with the cooling assemblies made of N-shaped and P-shaped semiconductor materials, which can ensure the temperature constancy of the sample table, liquid to be measured, which is filled inside a sample cup, is placed in the sample socket so that the temperature constancy can be ensured. The utility model can not be affected by environment temperature, and the measuring result is accurate.