The invention belongs to the field of tests of an aerospace servo valve and specifically relates to a dynamic loading device for a dynamic pressure feedback test of a servo valve. The device comprises a dynamic loading cylinder, a displacement sensor, a speed sensor, a pressure sensor, a loading servo valve, the to-be-tested servo valve and a dynamic pressure feedback testing instrument, wherein a piston rod is disposed in the dynamic loading cylinder; a piston is disposed in the piston rod; and the piston rod, the piston and the inner wall of the dynamic loading cylinder form four chambers. The device provided by the invention is characterized in that the dynamic loading cylinder with the four chambers is designed; the speed sensor, the displacement sensor and the pressure sensor are separately installed on the four chambers of the cylinder body, so that a load pressure difference loading function and a state detection function can be realized simultaneously; and closed-loop control of servo loading of the dynamic hydraulic cylinder can be used to keep a load pressure difference stable, efficiency and accuracy of the dynamic pressure feedback test are increased, and production of the dynamic pressure feedback servo valve is guaranteed.