The invention discloses a gardenia multi-branch floating bed water planting cuttage method. The gardenia multi-branch floating bed water planting cuttage method is characterized by comprising the following steps that a large branch with 3-5 shoots is selected, the diameter of the root of the branch is larger than 0.5cm, terminal buds grow on the two sections of the shoots, and 3-5 leaves are left for each shoot; the root part, with the length ranging from 2cm to 5cm, of the branch is immersed into the mixed solution of alpha-naphthylacetic acid and indolebutyric acid to be dipped for 2-3 seconds; a sunshade net shed with the 50% sunshade ratio is established on the outdoor cleaning water surface, and cutting slips are inserted into plastic foam which serves as a cuttage support to be cultured and protected. The gardenia multi-branch floating bed water planting cuttage method has the advantages that the water surface floating bed cuttage is adopted, the oxygen in the water is sufficient, the forming of the callus is facilitated, the water temperature is stable, the temperature difference between day and night is small, the air humidity on the water surface is high, the branch absorbs water easily, the leaves cannot wither and fall even when encountering water loss and can carry out the photosynthesis to synthesize nutrient substances, the root system is well developed, the ability of absorbing nutrients is strong, the survival rate in the process of cultivation is high, and the growing speed is high; frequent spraying and water changing are omitted, managing links such as intertillage and weeding in a nursery garden land and workloads are removed, the gardenia multi-branch floating bed water planting cuttage method is simple and easy to implement, and mass propagation can be achieved.