The invention discloses a microwave oven weight induction processing method and device. The processing method comprises the following steps: step S01, when weight of heated food changes, checking whether the absolute value of a difference between current weight and previous weight of heated food is larger than or equal to a preset weight interference value, and if so, turning to step S02,,otherwise, turning to step S03; step S02, displaying the current weight value of the heated food, and turning to step S04; step S03, displaying the previous weight value of the heated food, and turning to step S04; and step S04, calculating required heating time according to a received food cooking instruction, food category instruction and heated food weight. By the method and device disclosed by the invention, not only can the heating time of the heated food be calculated, but also the weight value of the heated food can be directly weighed and displayed.