Low-temperature performance test system for thermal protection material

The invention discloses a low-temperature performance testing system for a thermal protection material, and belongs to the technical field of thermal protection material testing. The technical problems that an existing low-temperature testing device is high in refrigeration cost and unstable in refrigeration are solved. The low-temperature performance test system comprises a furnace body, a low-temperature container and a refrigerating machine, the low-temperature container and the refrigerating machine are arranged in the furnace body; the refrigerator is communicated with the low-temperature container and can refrigerate the low-temperature container; an isolation sleeve and a heat conduction sleeve are arranged in the low-temperature container, the isolation sleeve is arranged above the heat conduction sleeve, the top end of the isolation sleeve makes contact with the furnace body, the bottom end of the isolation sleeve is embedded in an annular groove formed in the top face of the heat conduction sleeve,