The invention relates to the technical field of automatic control, and specifically relates to a jet-vane system non-linear frequency characteristic acquisition system and method, and aims for solving the technical problem that a traditional acquisition method only measures the output characteristic of a jet-vane actuator and cannot acquire the frequency characteristics of the whole system. The jet-vane system non-linear frequency characteristic acquisition system is characterized in that the jet-vane system non-linear frequency characteristic acquisition system comprises a servo test unit (101), a controller (102), an actuator (103), a transmission assembly (104), a vane surface (105) for a jet-vane, an angular rate gyroscope (106), a direct-current regulated power supply (107), a dynamic signal test device (108) and a data processing computer (109). The jet-vane system non-linear frequency characteristic acquisition system and method can test the frequency characteristics, including the structural characteristic of the vane surface for a jet-vane, of the whole jet-vane system, and can modify the jet-vane servo system and the control system to improve the performance of the vane system, aiming at the problem reflected by the test result, when the test result does not satisfy the design requirement.