The new variable tooth magnetic fluid seal structure was desigined based on the traditional magnetic fluid seal structure to improve the pressure resistance performance.Based on the theory of magnetic fluid seal pressure resistance,the distribution of magnetic induction intensity in the new variable tooth structure seal gap was studied by using ANSYS Maxwell software.The influence of variable tooth width coefficient and variable tooth height coefficient on the pressure resistance performance of magnetic fluid seal was analyzed by using the control variable method.The results show that with the increase of variable tooth width coefficient,the pressure resistance capacity of magnetic fluid seal first increases and then decreases,with the increase of variable tooth height coefficient,the pressure resistance capacity of magnetic fluid seal decreases gradually.When the variable tooth width coefficient and variable tooth height coefficient work together,the magnetic induction strength difference is the largest and the sealing pressure resistance performance is the best when the variable tooth height coefficient and variable tooth width coefficient are 1.1.