The effects of nitrogen，phosphorus and potassium combined application on the yield of different feeding parts of cassava and the fertilizer effect were explored to provide a basis for the standardized fertilization of cassava and ensure the supply of cassava grain feeding raw materials. The “3414” design was used in field experiment to determine the yield of cassava feeding parts at different time points，and the fertilizer effect interaction effect analysis and single factor effect analysis were conducted to screen the optimal fertilization scheme. The results indicated that different fertilization treatments had different effects on the yield of cassava feed parts at different time points. Nitrogen played an important role in the growth and development of cassava stems and leaves，potassium had a good promoting effect on the growth of underground tubers，cassava had a relatively stable absorption of phosphorus，and applying medium to low levels of phosphorus 3-8 months after planting could ensure normal growth of cassava. Harvesting whole cassava plants or aboveground parts for feeding should be supplemented with sufficient nitrogen，with a nitrogen fertilizer dosage of 75-150 kg/hm². With the advancement of the growth period，the growth of cassava gradually shifted from aboveground to underground. 8 months after planting，high biomass maintaining required appropriate potassium supplementation. N2P2K1(N 150 kg/hm²，P 150 kg/hm²，K 150 kg/hm²)treatment had the highest yield increase rate(27.02% higher than the control). The effects of different fertilization treatments on the yield of fresh cassava varied，and varied over time. Harvesting cassava tubers for feeding should be done 6-8 months after planting，and supplementing with potassium fertilizer of 150-450 kg/hm² was more conducive to improving cassava yield. In addition，although nitrogen fertilizer could promote the growth of cassava stems and leaves，high nitrogen in the later stage was not conducive to the accumulation of root starch. In the fertilization management of cassava feeding，nitrogen，phosphorus and potassium fertilizers should be applied reasonably according to different production goals.