A micro-carbon plant anthocyanin for facilitating advancement of fruit coloring and fruit plumpness, and a preparation method and application thereof are provided. The formula composition of the micro-carbon plant anthocyanin by mass percentage is 30-50% of plant anthocyanin having a particle size of 80-150 μm, 20-40% of micro carbon (abbreviation for water-soluble small-molecule carbohydrates) having a particle size of 100 μm and 20-50% of amino acids. By spraying a 100-500-fold dilution of the micro-carbon plant anthocyanin onto surfaces of foliage and fruits during the fruit development period of grapes and strawberries with a use amount of 10-50 kg/mu in the whole growth period, the colorization can be advanced by 5-15 days, and the harvested fruits have fragrant and sweet tastes, are completely filled, and have an excellent quality.
