The invention relates to fertilizer suitable for winter previous crops of alfalfa in the northern Henan Province. The fertilizer is suitable for being used in the regeneration earlier stage of the last crop of the alfalfa in autumn in the northern Henan Province area with soil and climate conditions represented by Yuan Yang. The ratio of nitrogen fertilizer to phosphorus fertilizer to potassium fertilizer is 20:26:5, the fertilizer is prepared from the raw materials in percentage by weight: 25% of urea, 65% of diammonium phosphate and 10% of potassium sulphate and is suitable for being appliedin the mode of being matched with irrigation at the regeneration earlier stage of the last crop of the alfalfa in autumn, and the fertilizing amount is 150 kg.hm<-2>. The fertilizer is easy to use and operate and can be utilized efficiently, thus the yield of the alfalfa is increased obviously, the quality of the alfalfa is improved obviously, the fertilizer efficiency can be improved, and soil pollution can be reduced.