A truly dual-code channel absolute value magnetic scale encoder feedback system. Suitable for high-speed, multi-jointed pulleys and operation scenarios. The encoding period of the magnetic scale is exactly the same. The periodic encoding length of the magnetic scale is 640mm. During the passage of the magnetic scale, the encoder automatically switches between zero position setting and absolute position information and maintains smooth communication. During the passage of the magnetic scale, the encoder has a very small detection blind zone.