The invention relates to the field of gardening, in particular to a method for automatically bundling a bouquet. The method comprises the following steps that 1, each flower branch sequentially penetrates through a corresponding hole formed in an upper reshaping disc and a corresponding hole formed in a lower reshaping disc; 2, the height of the flower branches is fixed as needed through positioning clamps arranged on inner split sheets of the upper reshaping disc; 2, the upper reshaping disc is rotated, the upper portion of the bouquet can be driven to rotate while the upper reshaping disc is rotated, and then spiral bouquet reshaping is completed; 4, a bundling mechanism is regulated to bundle and fix the bouquet; 5, the portions, exposing out of the lower reshaping disc, of the flower branches are cut off, so that the bottoms of the flower branches of the whole bouquet are flush; 6, electromagnetic induction disappears, and all the positioning clamps are loosened; 7, the bouquet and the upper reshaping disc are taken out. According to the method, the whole bouquet can be reshaped, and the flower branches of the reshaped bouquet are spiral; the structure is simple and easy to use, operation is convenient, and the method can be widely applied to various environments.