Preparation method for algal oligosaccharide-containing carbon-based organic fertilizer for rowan crops

The invention discloses a preparation method for algal oligosaccharide-containing carbon-based organic fertilizer for rowan crops. The preparation method comprises the following steps: treating algae,namely, cleaning fresh or dried marine alga plants and soaking the cleaned marine alga plants for 12 hours; preparing an alga liquid, namely, grinding the soaked algae into slurry and then filteringto remove large solid; performing enzymolysis on the alga liquid, namely, placing the alga liquid into an enzymolysis tank, adding bacilli, regulating the pH value to be neutral, and performing enzymolysis; performing centrifugal purification, namely, treating the alga liquid into a centrifugal machine for treating after the enzymolysis is completed, performing centrifugal treatment for 5,000 to 6,500 rpm, performing centrifugal treatment for 5 to 8 minutes, and then, concentrating a supernatant by a film evaporation technology to prepare an algal fertilizer liquid. According to the preparation method, charcoal and the