Mangrove plant seedling raising substrate and seedling raising method

The invention relates to the technical field of mangrove plant seedling raising, in particular to a mangrove plant seedling raising substrate and a seedling raising method. The substrate comprises beach sludge, sea sand, branch fertilizer, chicken manure and an AM microbial inoculum, and the volume ratio of the beach sludge to the sea sand to the branch fertilizer to the chicken manure to the AM microbial inoculum is (50-80): (10-40): (5-30): (5-15): (1-10). According to the mangrove plant seedling raising substrate, by adding the branch fertilizer into the substrate, the branch fertilizer enables the substrate to be loose and porous, and therefore development of mangrove plant roots is facilitated; in addition, the branch fertilizer serves as long-term fertilizer to supply fertilizer to mangrove plants for a long time, relative to the branch fertilizer, the chicken manure serves as short-term fertilizer to conduct early-stage fertilization on the mangrove plants, and the chicken manure and the branch fertili