The invention discloses a method using plants with root systems capable of secreting nitrification inhibitors to produce high-sugar-content tomatoes. The method has the advantages that the plants withthe root systems capable of massively secreting the natural nitrification inhibitors are utilized, and the rhizospheric ammonium nitrogen of the plants cannot be converted into nitrate nitrogen to supply ammonium nitrogen to the tomatoes; the root system characteristics of the plants are combined with the fertilizing technology capable of producing ammonium-nitrogen fertilizer, technologies suchas moisture regulation and control are also used to achieve joint regulation and control so as to produce the tomatoes high in sweetness and good in taste, and the method has an important applicationvalue.