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.