The invention relates to a granary detection method and system based on the standard deviation polynomial model of a single side ring of pressure sensors. A granary storage grain quantity detection model based on the single side ring of pressure sensors is provided on the basis of the specific requirements of the grain storage quantity detection of granaries of which the grain loading height is less than 10m, and the pressure distribution characteristics of the granaries. The method and system provided by the invention are characterized in that the method and system involve the arrangement model of the single side ring of pressure sensors and the granary grain storage quantity detection model based on the single side ring of pressure sensors. The model and the detection method of the invention have high detection precision, and can meet the requirement of the remote online detection of the grain storage quantity of the granaries of which the grain loading height is less than 10m.