The invention discloses chilli seed meal crude meal fiber powder and a preparation method thereof. The chilli seed meal crude meal fiber powder is rich in insoluble crude meal fibers, contains various nutrients, has health functions of strengthening stomach and aiding digestion and can be used as a main/accessory material of a functional food. The preparation method utilizes chilli seed meal as a raw material and realizes chilli seed meal spicy taste removal, deodorization and decolouring through mixing, distillation, solid-liquid separation, vacuum drying, cooling, crushing, sieving and packaging.