The utility model discloses a make things convenient for numerous structure that expands of simple and easy clump branch mycorrhizal fungi microbial inoculum, it includes greenhouse and seedbed (1), lays sterilization matrix (2) and the seed that contain clump branch mycorrhizal fungi microbial inoculum in seedbed (1), it has fertilization moisturizing device to peg graft on sterilization matrix (2) that contain clump branch mycorrhizal fungi microbial inoculum, transparent plastic beverage bottle (3) of fertilization moisturizing device for removing the bottle lid at the bottom of cutting away bottle, placed sponge (4) in the bottle. The utility model discloses is expanding numerous maintenance in -process, is adopting fertilization moisturizing device, first so both can the moisturizing, carry the nutrient solution, to the impact of seed, second moisturizing device is formed by the preparation of dumped beverage bottle in the time of can avoiding the moisturizing again and add the nutrient solution, has with low costs, raw and other materials and easily acquires advantages such as easy repacking, setting up of third sponge makes the release of nutrient solution slow even more, fertilizer use efficiency is higher.