Crystalline substance freezing point tester

The utility model discloses a freezing point tester for a crystalline substance, which comprises a heating furnace assembly for storing liquid corresponding to the crystalline substance with a freezing point to be tested, a thermocouple inserted into the heating furnace assembly and used for measuring the temperature of the liquid, and a display and controller electrically connected with the thermocouple, the button is electrically connected with the display and controller; the heating furnace assembly comprises a furnace body shell, a heat preservation cylinder and a heat transfer body which are sequentially arranged from outside to inside, a test tube which is sleeved in the heat transfer body and is used for storing liquid corresponding to a crystal substance with a freezing point to be measured, and a test tube cap which covers the top of the test tube; the middle part of the thermocouple penetrates through the test tube cap, and the lower part of the thermocouple is arranged in the test tube; and the low