Stepper motor system capable of detecting and error correcting through angle sensor

The invention relates to the technical field of a camera, particularly to a stepper motor system capable of detecting and error correcting through an angle sensor. A synchronous belt wheel is arranged on the lower end plane of the stepper motor; a motor axis and the friction-less angle sensor are arranged on the upper end plane of the stepper motor; and the friction-less angle sensor can detect a rotary angle of the stepper motor. By mounting the friction-less angle sensor on the upper end plane of the stepper motor, closed loop control on a camera which needs to perform a rotation motion on a monitoring system lens can be realized, so that a current or voltage signal in a real-time position can be obtained; the location of the lens can be solved by the signal and the speed ratio of the synchronous belt wheel on the motor, so that an effect of accurate positioning can be achieved; and automatic error correction is realized without being influenced by interference signals, mechanical vibration and air flow imp