Low-temperature brittleness tester

The utility model relates to the technical field of low-temperature brittleness testers, and discloses a low-temperature brittleness tester which solves the problems that in the using process of the low-temperature brittleness tester for plastic testing, plastic piece scraps generated in a low-temperature water tank are inconvenient to clean after testing, the operation of people is influenced, and the working efficiency is high. The device comprises an instrument body, a fixing plate is fixedly installed on one side of the top end of the instrument body, an air cylinder is fixedly installed at the top of the fixing plate, an impact block is installed at the bottom of the fixing plate, and the top of the impact block is connected with the bottom of the air cylinder; a low-temperature water tank is arranged right below the impact block and is positioned in the instrument main body; according to the low-temperature brittleness tester for the plastic test, in the using process of the low-temperature brittleness