Abstract: This paper takes the agricultural turbocharged engine is taken as the research object, and the fault of the engine lubrication system is analyzed. It is concluded that the main cause of the filter rupture in the engine lubrication system is the pressure fluctuation in the oil passage caused by the opening and closing of the regulating valve. By adjusting the design parameters of the valve, the pressure fluctuation in the oil passage of the regulating valve can be improved and the probability of filter rupture can be reduced. The analysis results show that when the front end of the filter is used to relieve the pressure of the control valve of the lubrication system, the diameter of the sensing hole is 8 mm, and three pressure bearing surfaces are set, the pressure fluctuation range in the main oil channel of the lubrication system is significantly reduced, and the fluctuation range of the valve core displacement is small.