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The present application relates to the field of edible oil quality monitoring, and particularly relates to an online edible oil quality monitoring system and method based on a multi-modal sensor, which extracts the pressing state characteristics of the outflowing oil liquid corresponding to the pressing process; calculates the pressing quality representation value of the outflowing oil liquid to mark the outflowing oil liquid; further evaluates and analyzes the quality of the outflowing oil liquid; extracts the flow disorder characteristics of the outflowing oil liquid in the entire pressing process to determine whether it meets the flow deviation fault tolerance requirement; according to the splashing height of the outflowing oil liquid entering the oil receiving container, in combination with the retention time and accumulation area of the foam in the oil receiving container, the quality deviation representation coefficient of the corresponding crude oil product is evaluated, the quality deviation level is determined, the corresponding color is marked, and a warning prompt information is sent. The present application realizes multi-dimensional and comprehensive edible oil quality monitoring by real-time online monitoring, timely discovery of edible oil production abnormalities, and improvement of monitoring accuracy.