Alginic acid fertilizer synergist prepared by bacterium-enzyme combination and preparation method thereof

The invention discloses an alginic acid fertilizer synergist prepared by bacterium-enzyme combination and a preparation method thereof. The alginic acid fertilizer synergist comprises the following raw materials in parts by mass: 60-80 parts of kelp leftovers, 3-5 parts of strains, 3-5 parts of an enzyme agent, 5-10 parts of a carbon source, 3-5 parts of a nitrogen source, 1.2-1.5 parts of mediumtrace elements, 0.4-0.6 part of a soil loosening agent and 30-50 parts of water. After cleaning, drying, crushing, fermenting and weak base extraction, a soil loosening agent and a plant growth regulator are sequentially added into a seaweed synergistic solution, the mixture is stirred uniformly and sealing is performed; the alginic acid fertilizer synergist has the advantages of realization of bacterium-enzyme combined fermentation, great acceleration of a substrate decomposition process, shortening of the fermentation process, great shortening of the production cycle of an alginic acid fertilizer, improvement of the