The invention discloses a nitrogen supplementing organic slow-release fertilizer for planting wheat, which comprises a fermented organic material, lignin, mica powder, coal gangue, peat soil, oil shale, calcium phosphate, potassium dihydrogen phosphate, diammonium hydrogen phosphate, calcium hydrogen phosphate, magnesium humate, boric acid, ammonium nitrate, iron urate humate, zinc humate, potassium sulfate, manganese sulfate, zinc acetate, molybdenum trisulfate, a nitrogen supplementing agent, and modified slow release agent. The organic slow-release fertilizer for planting wheat of the invention can provide nitrogen and other rich nutrient substances for wheat growth, has excellent slow release property, and effectively increases the yield and quality of wheat.