The invention discloses a special rice organic-inorganic compound fertilizer and a preparation method thereof, belonging to the agricultural resource recycling and environmental protection fields. The invention combines the two areas of the resource recycling of agricultural wastes and the development of new fertilizers together and adds fowl manure and rice bran in the inorganic fertilizer according to the growth characteristics and nutritional needs of rice to prepare the nutritious organic-inorganic compound fertilizer. The organic matter content of the compound fertilizer is 20.35%-25.16%, the total nutrient content is 19.57%-26.44%, wherein the nitrogen content is 8.9%-9.96%, the phosphorus pentoxide content is 3.99%-6.93%, and the potassium oxide content is 6.68%-9.55%. The compound fertilizer of the invention solves the post processing problem of fowl manure, avoids the pollution to the rural environment and combines the organic and inorganic nutrients so that only one basic fertilization is performed without aftermanuring so as to achieve the aim of saving cost, improving effect and increasing yield; in addition, the preparation process is easy, the requirement of machinery equipment used for preparation is low, the cost is saved and the compound fertilizer is applicable to large-scale promotion and application.