The invention discloses a vegetable seedling breeding matrix material made of a hickory cattail husk and a preparation method for the vegetable seedling breeding matrix material. The hickory cattail husk contains a plurality of alkaloid components and can kill or suppress survival or growth of other organisms; and the hickory cattail husk serving as the matrix material is mainly used in culture of the matrix at present. The vegetable seedling breeding matrix material made of the hickory cattail husk comprises the following raw materials in percentage by mass: 80 percent of hickory cattail husk, 5-10 percent of bean pulp and 10-15 percent of carbonized rice husk. The hickory cattail husk, the bean pulp and the carbonized rice husk are mixed and are subjected to stacking fermentation; and the obtained fermented product is subjected to solid and liquid separation by a screw extrusion method, so that alkaloid can be removed from the fermented product along with the liquid. Through fermentation, the alkaloid in the hickory cattail husk leaves out of the tissue and is removed through screw extrusion, so that the vegetable seedling breeding matrix material is formed; after the vegetable seedling breeding matrix material is mixed with other materials, a vegetable seedling breeding matrix can be formed; and the vegetable seedling breeding matrix material is suitable for large-scale production.