Abstract: To effectively prevent coal dust explosion accidents caused by accumulated dust in coal mines and fill the domestic gap in high-precision, online dust deposition intensity detection technology, this study developed a dust deposition intensity sensor based on the resistance strain cantilever beam sensing principle. The sensor integrates a parasol-shaped dust collection disc structure, a resistance strain cantilever beam structure, a Wheatstone bridge full-bridge strain measurement module, a differential analog signal amplification circuit, and a high-precision digital signal processing unit. Through calibration tests using standard weights, the study established a quantitative mathematical model between mass and output numerical signals, achieving reliable characterization of dust deposition mass. Further, the research systematically investigated the influence of parasol-shaped dust collection disc diameter on sensor mass measurement errors and the mechanism of disc surface inclination on dust collection efficiency and self-cleaning performance, thereby determining the optimal structural parameters of the dust collection disc and clarifying the dust deposition intensity characterization model. Finally, experimental results demonstrated the sensor's high online detection accuracy: dust deposition mass measurement error is less than 0.1 g, with a resolution of 0.01 g; absolute error in dust deposition intensity measurement is less than 0.0022 g/cm2, with a resolution of 0.0001 g/cm2. These findings provide robust technical support for effective monitoring and proactive prevention of coal dust explosion risks in coal mines.