In order to explore the influence of magnetic fluid seal pole tooth parameters on the thermal characteristics of the magnetic fluid,the heat transfer calculation model of the magnetic fluid seal device was constructed based on heat transfer theory,and the relationship between magnetic fluid temperature and seal gap,pole tooth width,pole tooth slot width and pole teeth height at different rotating speeds was studied.The influence of seal gap,pole teeth width,pole tooth slot width and pole teeth height on magnetic fluid temperature was studied on the magnetic fluid sealing test bench,and the experimental results were verified by the calculation results of the model.The test results show that with the increase of sealing gap and pole teeth height,the magnetic fluid temperature gradually decreases in a negative exponential change trend,with the increase of pole teeth width,the magnetic fluid temperature increases linearly,and with the increase of pole teeth width,the magnetic fluid temperature is basically unchanged.The sealing gap has the greatest influence on the magnetic fluid temperature,followed by the pole teeth width and the pole teeth height.The pole tooth slot width has no effect on the magnetic fluid temperature.The research results show that increasing the sealing gap and the pole tooth height within a certain range,and reducing the pole teeth width can reduce the heat generation of the magnetic fluid and increase the life of the magnetic fluid sealing device.