The invention discloses a piezoelectric driving pump using a light ball valve. The piezoelectric driving pump comprises a piezoelectric ceramic piece, a piezoelectric vibrator, a connector, a rubber film, a PDMS thin film and seven layers of square acrylic plates, wherein the third acrylic plate, the fourth acrylic plate and the fifth acrylic plate are each provided with a fluid channel, a small ball is arranged in the fluid channel in the fourth acrylic plate and floats or sinks along with decreasing or increasing of the volume of a cavity body of a lower pump cavity, and therefore the smallball has the one-way ball valve effect in the fluid channels. A buffer cavity is arranged at the pump water in-out opening position, energy losses caused by inertia force of the fluid are reduced, high frequency work of the pump is achieved, the high-frequency high-power density character of piezoelectric ceramic is achieved, and the pump performance is improved. The small ball is made of a polystyrene material, the acrylic plates forming the cavity body of the piezoelectric is made of PMMA materials, the structure is simple, and the acrylic plates can be used for disposable and economical piezoelectric pumps.