The present invention discloses an organic fertilizer which is prepared by mixing the following components in weight percentages: straws 20-35, silicate slags 25-45, soybean hulls 2-7, rice husk powder 5-20, calcium superphosphate 10-20, potassium sulfate 6-17, potassium carbonate 7-25, humic acid 1-10, nitrogen fertilizers 5-35, potash fertilizers 17-37, potassium humate 10-12, pig manure 12-16, trace elements 2-3, urea 10-15, superfine phosphorite powder 25-28, straws 40-60, urea 3-10 and potassium sulfate 1-5. Beneficial effects of the invention are that: the invention provides an organic fertilizer, and the organic fertilizer can increase the yield, improve the soil quality, prevent disease and inhibit bacteria, resist stress and eliminate phytotoxicity, and is low in cost of raw materials, simple in process and free of residue and pollution. The organic fertilizer is based on organic nutrients, reasonably formulates a proper amount of inorganic fertilizer, not only can provide comprehensive and reasonable nutrients to crops, but also can comprehensively improve the soil quality to increase soil fertility, is rapid and lasting in fertilizer efficiency, does not cause fertilizer damage, can provide comprehensive and balanced nutrients to the crops, and greatly improves crop resistance to disease.