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The experiment was to determine the effect of seaweed fertilizer on the yield and nutritional value of alfalfa in returning green stage. The alfalfa cultivar Jinneng 5020 was used as experimental materials, it was sprayed seaweed fluid fertilizer P1 (1 g/m²) and P2 (2 g/m²) at a dilution of 650 times, and the alfalfa in control group was sprayed by water. The indicators were measured during the budding period. The results showed that the seaweed fertilizer treatments significantly improved the plant height, leaf weight, yield of alfalfa and SPAD value. Compared with control group, the CP content of P1 treatment was significantly decreased (P<0.05), the ADF content and NDF content were significantly increased (P<0.05). Compared with control group, CP content of P2 treatment was increased. Compared with control group, the seaweed fertilizer treatments decreased the ton milk index, but significantly increased the milk production per unit area of forage (P<0.05). The study indicates that it was suitable to apply 2 g/m² of seaweed fertilizer, 650 times dilution and spraying on the leaves of alfalfa in the Yellow River beach area during the green returning period, which can achieve the goal of increasing the alfalfa yield and planter income. [ABSTRACT FROM AUTHOR]