The invention relates to a thermal
physical property measuring device, which comprises a refrigerating
machine (2) and a sealed vacuum cavity (1), wherein the refrigerating
machine supplies cold energy to a sample to be measured so as to decrease the temperature of the sample to be measured to a measurement temperature, and the sealed vacuum cavity supplies a vacuum heat-insulating environment for measurement. The thermal
physical property measuring device is characterized by further comprising a sealed
sample chamber (8), a sample rack inserting
pipe (6) and a sample rack (7), wherein the sealed
sample chamber holds the sample to be measured; the sample rack inserting
pipe is a tubular component; one end of the tubular component is a closed end; the other end of the tubular component is an open end; the closed end extends into the vacuum cavity (1); a first end of the sample rack is connected with the
sample chamber (8); a second end of the sample rack is detachably and hermetically jointed with the open end of the sample rack inserting
pipe (6); and the sample chamber (8) and the sample rack (7) which are connected mutually are suitable to be inserted into the sample rack inserting pipe (6). The device is mainly used for measuring the thermal
physical property of the sample to be measured at a lower temperature, and compared with a conventional thermal physical property measuring device, the thermal physical property measuring device provided by the invention has the advantages that the sample is convenient and quick to replace, the test period is short, and the like.