Ultralow temperature impact testing device

The utility model provides an ultralow temperature impact testing device comprising an impact support and a bracket, wherein an impact blade and a dial are arranged above the impact support; a hydraulic cylinder is arranged at the bottom end of the impact support; a cooling groove is connected above the hydraulic cylinder; a test sample fixing platform is arranged above the cooling groove; and the cooling groove is filled with liquid nitrogen. According to the utility model, an impact test board and the test sample fixing platform are cooled by utilizing the ultralow temperature performance of the liquid nitrogen; the temperature of a test sample is controlled by a temperature controller; and when the temperature of the test sample achieves the required temperature of the test, the low-temperature groove is moved downwards and the absorbing energy of the impact test board is obtained in a way of displaying the difference between the potential energy before the impact and the residuary potential energy after t