The invention discloses a special gardenia fertilizer as well as a preparation method and application thereof. The special gardenia fertilizer comprises the following raw materials in parts by weight:18-26 parts of cinerite soil, 2-6 parts of urea, 3-7 parts of a phosphorus-potassium nitrate fertilizer, 11-19 parts of macleaya cordata, 23-31 parts of akebiaquinata and 25-35 parts of sophora alopecuroide. The preparation method comprises the following steps: mixing cinerite soil with an acetic acid solution, sealing, heating, stirring, drying, and calcining so as to obtain pretreated cineritesoil; mixing and mixing macleaya cordata and akebiaquinata, soaking with absolute ethyl alcohol, adding deionized water, heating, and filtering so as to obtain filtrate; crushing sophora alopecuroide,adding the acetic acid solution, heating, stirring, adding the filtrate, performing ultrasonic treatment, performing centrifugal separation, and abandoning precipitate so as to obtain a mixture; mixing the pretreated cinerite soil with the mixture, uniformly stirring, drying, adding urea and the phosphorus-potassium nitrate fertilizer, uniformly mixing, and pelletizing, thereby obtaining the special gardenia fertilizer. With a small amount of the special gardenia fertilizer, the morbidity of anthracnose and yellow diseases of gardenia can be greatly reduced, the flower amount is increased, the flowering time is prolonged, flowers can be relatively large in size, and a weeding effect can be also achieved.