Efficient and green copper preparation for preventing and treating diseases as well as preparation method and application of efficient and green copper preparation

The invention discloses an efficient and green copper preparation for preventing and treating diseases as well as a preparation method and application thereof. The preparation method of the efficient and green copper preparation for preventing and treating the diseases comprises the following steps: slowly adding a copper sulfate solution into an ammonium bicarbonate solution under the conditions of stirring and heating, and after the reaction is completed, obtaining a cupric sulfate solution; and slowly adding the cupric sulfate solution into lime water under a stirring condition, and reacting to obtain the efficient and green copper preparation for preventing and treating diseases. The bactericidal composition has the advantages of the Bordeaux mixture and the copper ammonium mixture, can sterilize, can safely and continuously play a role, and can well prevent, control and treat the citrus canker; meanwhile, the probability that a copper preparation is prone to phytotoxicity in daily use is greatly reduced,