Due to the limitation of power and torque of driving motor,some dynamic sealing occasions have clear requirements on starting torque requirements.Compared with the traditional seal forms,the magnetic liquid seal has significant advantages in starting torque.However,in different environments,the starting torque of magnetic liquid seal fluctuates greatly,which cannot meet the dual requirements of pressure and torque for some extreme sealing occasions,thus limiting the application range of magnetic liquid seal in such sealing occasions.As temperature being an important factor,experiments on the pressure resistance ability and the starting torque of magnetic liquid sealing at different temperature were carried out,and some significant results of the relationship between temperature and sealing pressure resistance ability were obtained.The results show that the smaller the gap of magnetic fluid seal,the greater the pressure resistance ability.The lower the temperature,the greater the maximum pressure resistance ability,and the maximum pressure resistance value at -40 ℃ is 5 times that at 80 ℃.The starting torque decreases gradually with the increase of pressure.The lower the temperature,the greater the starting torque,and the starting torque at -40 ℃ is close to 5 times that at 20 ℃.The amount of low-temperature magnetic fluid has a significant impact on the sealing starting torque.