The invention is applicable to the technical field of crop drought resistance, and discloses a biogenic drought resistance stimulant, a crop fertilizer and a crop fertigation method. The biogenic drought resistance stimulant comprises the following components in parts by weight: 40-60 parts of a trichoderma fermentation extract, 20-30 parts of a fulvic acid mixture and 10-20 parts of citrate. The biogenic drought resistance stimulant uses the trichoderma fermentation extract as a drought resistance activating active component, uses the fulvic acid mixture as an organic carrier, and uses the citrate of medium and trace elements as a nutrition regulating component, so that after crops use the biogenic drought resistance stimulant in an arid environment, the drought resistance of the crops can be effectively improved, that the crops can effectively absorb nutrients needed during growth can be ensured, and a significant effect of increasing the yield of the crops in the arid environment is achieved.