In order to solve the problem of precision machining of wavy end face mechanical seal,based on the characteristics of convergent grooves with lower leakage and higher hydrostatic pressure effect,a stepped convergent groove mechanical seal structure derived from the wavy end face mechanical seal structure was proposed.Considering the cavitation effect,CFD fluid simulation analysis was carried out for the sealing performance of the mechanical seal under different structural parameters and working conditions.The results show that the operating conditions and structural parameters have a significant effect on the cavitation effect of liquid film.As the film thickness,the sealing pressure and the groove depth increase,the cavitation effect of liquid film decreases,and as the rotating speed increases,the cavitation effect increases.The evaluation of sealing performance based on the open leakage ratio shows that the stepped convergence groove mechanical seal can achieve optimal sealing performance when operating at small film thickness,high speed,lower sealing pressure,and smaller depth of static ring groove.However,to ensure that the liquid film on the sealing end face has sufficient bearing capacity,the groove depth should not be too small.