The invention is suitable for the technical field of automobile simulation experiments, and provides a real-time steering wheel rotation angle acquisition system. A rotation angle signal collector generates pulse signals according to rotation of a steering wheel steering lever, and sends the generated pulse signals to a rotation angle signal processor, the rotation angle signal processor performs accounting according to the received pulse signals, calculates a corresponding steering wheel rotation angle according to a counting result ad sends the rotation angle to a terminal device, and the terminal device generates rotation angle data of the steering wheel according to the counting result and a prestored calculation formula. Compared with the prior art, the system provided by the invention is easy to install, and has no influence on a mechanical structure of a vehicle, signals collected by use of the system are consistent with other electronic control signal of the whole vehicle, difference does not occur, and signal collection is high in precision and fast in speed.