Abstract: This paper proposes a new type of magnetic fluid seal pole tooth profile structure. By moving the shaft sleeve along the axial direction, the sealing gap can be adjusted, which facilitates the regulation of both the sealing gap and sealing ability in practical applications. The pressure resistance formula for magnetic fluid seals was derived, and finite element analysis was performed using Ansys Electronics Desktop software. The results show that the proposed new pole tooth structure can effectively enhance the performance of magnetic fluid seals. Specific examples were used to investigate the influences of various structural parameters on sealing performance, and relevant curves reflecting the influence laws were obtained, followed by explanation and analysis. The research results indicate that within a certain range, the smaller the tilt angle, the smaller the sealing gap, the narrower the tooth thickness, and the wider the tooth slot width, the stronger the sealing ability. The position and tooth height of the permanent magnet have no significant impact on the sealing effect. Through regression analysis, it is concluded that in practical engineering design, priority should be given to optimizing the sealing gap and tooth thickness to achieve the optimal sealing effect.