An electro-hydrostatic actuator driven by the magnetostrictive rod is designed in this paper. Through the rectification of the active valve, the unidirectional flow of the oil in the actuator is realized, and by changing the phase angle of the driven current, the bidirectional movement of the actuator and the output of the continuously controllable flow are realized. The mathematical modelling of the actuator system is carried out by MATLAB/Simulilnk and the relationship between the phase angle and the output flow of the actuator is analyzed. Finally, a test platform for the actuator performance is set up. By changing the phase angle of the drive current, the bidirectional output displacement of the actuator is measured, and the actuator output flow at different drive frequencies is obtained. The experimental results show that the maximum no-load output flow of the actuator is 1.28 L/min when the bias pressure of the actuator system is 0.6 MPa and the driving frequency is 120 Hz.