The utility model provides a sand well leak protection standing valve assembly. This standing valve assembly includes top connection, lower clutch, ball valve, pilot valve and valve rod, and top connection and lower clutch are the reducing cylinder pipe of middle part through cutting oblique transition, and the upper portion diameter of reducing cylinder pipe is less than the lower part diameter, and reducing cylinder intraduct reducing department is equipped with circular bead, top connection lower part and lower clutch upper portion spiro union, the ball valve is installed on the inside circular bead of top connection, and the pilot valve is installed in the inside circular bead department of lower clutch, and the ball valve passes through the valve rod with the pilot valve and links to each other. The utility model discloses can prevent effectively that well liquid from containing sand and drawing the damage disk seat, extension standing valve life improves oil field development economic benefits.