The invention relates to the technical field of pest control over dragon fruits, in particular to a pest control method for planting solanaceae crops in a dragon fruit orchard. According to the method, pretreated dragon fruit branches are subjected to cuttage around cement piles in the middle ten days and last ten days of March, then transplanting pretreatment is conducted among lines of the dragon fruits, peppers are transplanted at the two sides of the dragon fruits, field management is conducted, and after harvesting is completed, tomatoes are transplanted. According to the method, the dragon fruits, tomatoes and peppers are intercropped, the among-line space of the dragon fruits is sufficiently utilized, effective utilization of land of the dragon fruit orchard is achieved, the absorption rate of the dragon fruits is stimulated, and nutrient absorption by the dragon fruits is improved; through the cooperation of physiological properties of various fruits and vegetables, the growthof weeds and breeding of harmful microbes are inhibited, the physical and chemical properties of the soil are improved, nutrient loss of the soil is prevented, and the growth capacity of the crops isimproved; by treating the dragon fruits, the tomatoes and the peppers separately, the pest prevention capacity of the crops is improved, the occurrence rate of pests is lowered, and the pest damage ofaleyrodid, helicoverpa armigera and aphids is overcome.