To ensure the stability of the output flow rate and pressure, a metal-rubber high-pressure precision flow valve is designed by using piezoelectric ceramic and metal rubber. It uses piezoelectric ceramic to drive main valve core to accurately control opening displacement between the spool and valve. As metal rubber has porosity, decompression, throttling and filtering characteristics, it can make the output fluid flow more smoothly and ensure the stability of the output flow rate and pressure. Based on Fluent, the smooth of the outlet fluid flow and the influence of metal rubber parameters on distribution of fluid turbulent kinetic energy in valve chamber are simulated. The results show that after installing the metal rubber ring at inlet and outlet, the velocity of output fluid flow changes smoothly and the directions reach unanimity, so that the flow of outlet is gentler. Thus, to some extent the metal rubber can ensure the stability of the output flow rate and pressure. In addition, after installing the metal rubber ring, the fluid turbulent kinetic energy in valve chamber is significantly reduced and the flow field of valve chamber tends to be more stable, so that the service life and on-off reliability of valve are improved.