The invention provides an actual working state simulation experiment device of a steering device. The actual working state simulation experiment device of the steering device comprises a steering device fixing device, a hydraulic source, a pressure transmitter, a linear hydraulic cylinder, an electromagnetic control valve, a pull pressure sensor, a frequency-variable motor and a controller, wherein the steering device fixing device comprises a base, a torsional rod clamping block, a screw rod clamping block and a bearing seat. A screw rod and a torsional rod of the steering device are respectively fixed, an assistant force is provided for the steering device by the hydraulic source, a pull force and stress are applied to a rockshaft of the steering device, forces are simultaneously appliedto the screw rod and the torsional rod of the steering device so that forces are simultaneously applied to the screw rod, the torsional rod and the rockshaft, and the actual working state of the steering device can be simulated; and whether abnormal conditions such as oil permeation, clamping and rockshaft breakage are occurred are judged when the rockshaft is stressed, and whether fatigue failure of the steering device is generated is judged if the abnormal conditions are occurred.