The invention discloses a large-flow high-frequency response electrohydraulic vibration device based on parallel servo valves and a control method. The electrohydraulic vibration device comprises more than two servo valves; an oil inlet of each servo valve is connected with an oil source; an oil return opening of each servo valve is connected with an oil return tank; a first working oil port of each servo valve is connected with a first oil port of a double-rod symmetric hydraulic cylinder; a second working oil port of each servo valve is connected with a second oil port of the double-rod symmetric hydraulic cylinder; a displacement sensor is connected with a piston rod of the double-rod symmetric hydraulic cylinder; and the displacement sensor and the servo valves are all connected with a controller. By adopting a combined method for synchronously controlling the phase shift and the variable amplitude of instruction signals of the servo valves, the problem of desynchrony of valve core motion is solved, and the vibration amplitude generated by the double-rod symmetric hydraulic cylinder under the driving of all the servo valves reaches the maximum.