The invention discloses a fertilizer and pesticide combination reagent for preventing and killing bacterial canker of kiwifruit and a preparation method of the fertilizer and pesticide combination reagent. The fertilizer and pesticide combination reagent is prepared from the following raw materials in parts by weight: 200 parts of agricultural amino acid water soluble powder, 40-50 parts of anhydrous zinc chloride, 45-65 parts of anhydrous manganese chloride, 40-80 parts of a ciprofloxacin active compound or a ciprofloxacin active compound, 100-200 parts of a 14% methyl chloride isothiazolinone water agent, 100-150 parts of oxine-copper active compound, 0.1 part of forchlorfenuron, 0.1 part of a 5-nitroguaiacol sodium salt active compound, 0.5 part of an alpha-pimacol active compound, 350-450 parts of molasses microbial fermentation concentrate solution, 0.2-0.25 part of sodium polyacrylate powder, 50-60 parts of No.YD-7 liquid fertilizer synergia solution, 0.1-0.2 part of industrial alcohol and the balance of deionized water to supplement the raw materials to 1200-1250 parts. The fertilizer and pesticide combination reagent disclosed by the invention is a high-density liquid product with fertilizer and pesticide effects, has good affinity for both water and plants, mainly contact and kill plant bacteria, and can also kill pathogenic fungus. A layer of compact organic pesticide and fertilizer film is formed outside a tree body when the fertilizer and pesticide combination reagent is applied in large concentration, and a sustained release function is exerted.