The invention discloses a triaxial under-pressure freezing ice-making method. The triaxial under-pressure freezing ice-making method comprises the four steps of device assembling, temperature controlparameter obtaining, pressurization freezing and mechanical testing; a device comprises a loading system, a temperature control system and a temperature measuring system; and the loading system comprises a loading frame, a pressure and volume controller, a triaxial pressure chamber and an oil filling pump. The device and the ice-making method are combined to realize the controllability of a stressfield and a temperature field in the whole process of pressurization, freezing and testing of a sample, the sample meeting the triaxial testing specification under different freezing pressure and freezing speed conditions can be made, and the triaxial under-pressure freezing ice-making method is suitable for researching the influences of the freezing pressure and the freezing speed on the mechanical property of ice; and the experimental efficiency is high, toxic or flammable and explosive materials are not involved, and thus safety and environmental protection are achieved.