The invention discloses a preparation pulping method of a food processor and the food processor, the food processor comprises a crushing cup, the volume of the crushing cup is V. The pulping method comprises the following steps: obtaining a target pulping amount; the method comprises the steps that when the target pulping amount is larger than 0.8 V and smaller than 0.95 V, initial cooked milk making is conducted firstly, after cooked milk making is completed, the initial cooked milk is blended in a smashing cup, and when blending is conducted in the smashing cup, water is blended in multiple times, and the target pulping amount is obtained. And after the soybean milk is cooked, the inflowing water is blended for multiple times, so that the soybean milk amount in the crushing cup is gradually increased to the target soybean milk amount. The forming of cold foam and boiling foam can be reduced as much as possible, the space is further prevented from overflowing, the single-time pulping boundary is further improved, and the pulp quality uniformity and pulping efficiency of discharged pulp are further improved. And meanwhile, when large-capacity pulping is carried out and further blending is needed, more thick pulp can be provided, the quality of the pulp blended outside the crushing cup is improved, and layering is reduced.