An organic fertilizer for plantation of paddy rice is prepared from the following raw materials, by weight, 10-15 parts of corn straw, 15-20 parts of bean straw, 4-7 parts of indolebutyric acid, 25-30 parts of potato straw, 30-35 parts of rape-seed cake, 5-7 parts of silicon fertilizer, 20-30 parts of silicate, 4-8 parts of potassium chloride, 3-9 parts of monoammonium phosphate, 4-8 parts of talcum powder, 3-5 parts of microbial strain, 15-25 parts of livestock excrement, 10-20 parts of urea, 3-9 parts of ammonium bicarbonate, 5-9 parts of zinc sulfate and 7-9 parts of an additive. The additive is prepared from the following raw materials, by weight, 10-15 parts of an organic material, 8-10 parts of trace elements, 0.3-0.5 part of an antimicrobial active component, 4-7 parts of a sustained release agent, 3-5 parts of humic acid and 2-3 parts of a virucide for plant. The invention provides an organic rice fertilizer which has advantages as follows: dosage of a fertilizer is minimized, nutrients are balanced, and soil quality is improved. With the additive and a common fertilizer used together, utilization rate of the fertilizer can be effectively raised, and the soil environment can be improved.