Fruit-protecting reagent capable of promoting spike-stalk stretching of grape cluster and preparation method of fruit-protecting reagent

The invention discloses a fruit-protecting reagent capable of promoting spike-stalk stretching of a grape cluster. The fruit-protecting reagent is prepared from the following raw materials in percentage by mass: 2.0%-4.0% of gibberellic acid, 0.1%-0.8% of naphthylacetic acid, 2%-5% of phethalanilic acid, 3.0%-4.3% of brassinosteroid, 5%-15% of dimethyl sulfoxide, 0.1%-1.0% of an emulsifier and the balance being ethanol. In addition, the invention further discloses a preparation method of the fruit-protecting reagent. The fruit-protecting reagent is capable of promoting longitudinal division, longitudinal extension and elongated growth of plant cells, and playing a role in stretching spike-stalks; a few of poorly fertilized flower buds and fruitlets are drained off in the spike-stalk stretching process; the chemical flower and fruit thinning effect is achieved; a space is created for fruit inflation; and meanwhile, the well fertilized and developed effective fruits can be reserved, so that the blossom and fruit preservation effect is achieved.