The invention discloses a steering wheel angle sensor and relates to the field of vehicle information acquisition. The steering wheel angle sensor mainly comprises a gyroscope signal acquisition module, a single-chip microcomputer data processing module, a Hall angle correction module and a CAN bus sending module. According to a system, a single-chip microcomputer is adopted for data acquisition and processing, the angular velocity and the angle value of a steering wheel are calculated, and then real-time output is carried out through a CAN communication interface. The hall angle correction module triggered by a permanent magnet in the system can effectively remove accumulated drift errors of a gyroscope. Comparison experiments indicate that the designed sensor has the advantages of beinggood in measuring precision, wide in measuring range, simple in structure, stable in performance and the like.