The invention discloses a preparation method of a slimming capsule containing perilla meal, basil seeds and abelmoschus esculentus. The preparation method comprises the following steps: processing the perilla meal, basil seed powder and abelmoschus esculentus powder and preparing a finished product, wherein the processing of the perilla meal comprises perilla seed treatment, low-temperature pressing, extrusion treatment and superfine crushing; the processing of the basil seed powder comprises basil seed powder treatment and superfine crushing; the processing of the abelmoschus esculentus powder comprises picking, selecting, washing, pulping, pre-freezing, freeze-drying and crushing; and the finished product preparation comprises the steps of mixing the perilla meal, the basil seed powder and the abelmoschus esculentus powder, sub-packaging, packaging, selecting a capsule wall material according to product requirements, performing sub-packaging and packaging. According to the preparation method disclosed by the invention, the perilla meal, the basil seeds and the abelmoschus esculentus are prepared into powder respectively, and then are fully mixed to prepare a capsule product, so that a slimming food, which contains soluble fibers, can promote excretion of organic substances in a body, reduces the accumulation of toxins in the body, reduces the content of cholesterol, and has satiety, can be provided.