The flow field model of the blade cavitation cleaner was analyzed according to the area equivalent method. The parametrization program was compiled on MATLAB software platform. Based on the Rayleigh-Plesset equation, the single bubble dynamic model of the equivalent flow field was solved numerically with the 4-5 order Runge-Kutta method. The change law of flow field character during the single bubble growth and collapse was gotten. The results show that the area equivalent method provides a means for the analysis of the characteristics of single bubble flow field in complex flow field. The bubble collapse occurs near the inlet of the flow field at x/x0=0.155, which produces extreme heat, high pressure and high speed micro jet when the bubble collapse. The blade cavitation cleaner can effectively remove pipe fouling.