The invention provides a high-yield planting method of simultaneously ripe five-spike ricinus communis, solving the problems of low acre yield, simultaneously ripe recovery failure, difficult mechanical harvesting and the like of the existing ricinus communis planting method. At first, organic fertilizer and ternary compound fertilizer are applied; next, seeds are sowed; when growing out three to four main leaves, each seedling is fixed; when each seedling grows out five to six main leaves, a terminal bud is removed, and five main leaves are kept; moreover, paclobutrazol is sprayed onto the seedlings; when four to five class-one branch spikes of each seedling grow out flower buds, the intertillage ditching is performed at the flowering stage; furthermore, topdressing carbamide and diammonium phosphate are applied; after seven to ten days since pollination on all class-one branches of the ricinus communis seedlings, a chemical solution formed by blending pidine, 83% of maleic hydrazide, washing powder and water is sprayed onto the ricinus communis seedlings; and finally, when 80% to 85% of fruit in the ricinus communis plant is in dark brown, the fruit can be picked and harvested. With the adoption of the planting method provided by the invention, the simultaneously ripe harvesting is realized; the acre yield, the grain weight and the oil ratio are improved; and the mechanical harvesting can be realized.