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This invention relates to the field of data fusion processing technology, specifically disclosing an ultrasonic water meter anti-theft method based on multi-sensor fusion and multi-level response. This invention achieves comprehensive detection of various water theft behaviors such as magnetic interference, physical damage, and casing deformation through a sensor monitoring network; accurately identifies the type and severity of anomalies through multi-source information fusion and intelligent level judgment; securely protects communication data through encryption authentication and rolling code mechanisms; and implements differentiated handling from record keeping and remote alarm to valve shut-off through a hierarchical linkage response mechanism, effectively improving the comprehensiveness of ultrasonic water meter anti-theft monitoring and the adaptability of response handling.