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This invention provides a canned motor pump rotation detection device and its operating method, belonging to the field of canned motor pump condition monitoring and fault diagnosis technology. The device includes a main control unit, a signal processing unit, a dual-mode output interface, and a power management unit. Phase difference pulse signals are collected by orthogonally arranged eddy current sensors. After amplification and shaping by the signal processing unit, the main control unit determines the pump rotor shaft rotation direction using a digital phase detection algorithm. The device features an LED display and a data communication output interface unit, supports RS-485 communication and wide voltage power supply, and has reverse connection protection. This invention achieves non-contact rotation detection through the cooperation of orthogonal eddy current sensor modules and an iron encoder disk triggering mechanism. The device has a compact structure, rapid response, and is unaffected by shaft deflection and torsional deformation, making it suitable for real-time monitoring and fault diagnosis in various industrial environments.