Piezoelectric hydraulic control valve and vehicle electro-hydraulic line control brake system

The invention discloses a piezoelectric hydraulic control valve and vehicle electro-hydraulic line control brake system, wherein the piezoelectric hydraulic control valve comprises a screw plug, a shell body, a piston, a reset spring, a valve core and a piezoelectric element for generating mechanical deforming in the axial direction of the valve core to form an axial thrush in the direction after being subjected to an external electric field. The screw plug is connected onto the shell body by threads, the piston and the piezoelectric element are positioned in the shell; one side of the piston, the shell body and one face of the valve core define a brake fluid cavity filled with brake fluid; the other side of the piston is abutted against the piezoelectric element; an oil inlet and an oil outlet are arranged on the shell body; the valve core is positioned in the shell body; a pair of flow limiting parts are arranged on the shell and the valve core and are matched with each other. The piezoelectric hydraulic control valve is used as the oil inlet and outlet oil path control valve of the vehicle electro-hydraulic line control brake system, the frequency and precision in pressure adjusting are improved, and the dynamic responding performance and brake performance of the brake system are improved.