The invention relates to a nutritional type copper fungicide and a preparation method. Microelements such as boron, zinc, manganese, molybdenum and the like are added to a copper ammonia complex, ethylenediamine having a bactericidal function and an efficient copper ion chelating agent is added, meanwhile, citric acid capable of promoting the tricarboxylic acid cycle is added to be used as a complexing agent, EDTA (ethylene diamine tetraacetic acid) and the like are added to be used as chelating agents, and a liquid compound which has a copper protective bactericidal function and a systemic bactericidal function and is added with the microelements to promote growth of crops is formed. According to the deep bluish violet compound solution, extremely few water insoluble matters exist, the concentration of free copper ions is very low, the antibacterial spectrum is wide, effects of controlling blight, powdery mildew, early blight and the like (endogenous and soil-borne plant diseases) of the crops are good, phytotoxicity does not occur easily, and growth and yield increase of the crops can also be promoted. The production process is simple and easy to implement, raw materials are easy to obtain, the production cost is lower, and popularization is facilitated.