The invention relates to vigour-consolidating porridge with low glycemic index after dinner and further relates to a factory preparation method of the health-care porridge. The vigour-consolidating porridge with low glycemic index comprises the following solid ingredients and contents: 23.1-38.5 percent of black rice, 27.5-42.9 percent of barley, 6.8 percent of chickpea, 11.9 percent of mung bean, 6.8 percent of soybean, 3.4 percent of red lentil and 5.1 percent of konjac; and liquid ingredient is an oat fiber aqueous solution, in which the proportion of oat fiber to water is 1: 26. According to the vigour-consolidating porridge with low glycemic index, disclosed by the invention, adopts organic raw materials and is prepared by completely using a physical processing method without adding any preservatives, so that all natural nutrients in the raw materials are preserved; in addition, a functional food base material, that is, oat fiber is added in the processing process; the oat fiber can be used for effectively limiting absorption of fat in digestive tracts, promoting excretion of lipid compounds, increasing satiety, reducing food intake and promoting slowing of glucose absorption, so that the blood glucose level after dinner is lowered, the blood lipid is lowered and the obesity is prevented.