The invention provides a timed and circulating AM (
arbuscular mycorrhizal)
fungus expanding propagation and functional experiment device and relates to culture of soil microorganisms. The device is provided with an
incubator cover, an
incubator, a culture medium, a space for adding an
isotope and the like, a
hypha chamber, a water drainage tank cover, a water drainage tank, a filter pump, a
plant growth chamber, a
nozzle regulation and control hook and a nylon net, wherein the
incubator cover covers the incubator, the incubator is divided into the
hypha chamber and the
plant growth chamber by virtue of a longitudinal net, the culture medium and the space for adding the
isotope and the like are placed in the
hypha chamber, and a water drainage hole is formed in the bottom of the incubator; the water drainage tank is arranged at the bottom of the incubator, the water drainage tank cover covers the water drainage tank, the filter pump is arranged in the water drainage tank, the
nozzle regulation and control hook and the nylon net are arranged in the
plant growth chamber, an atomizing
nozzle is formed in the nozzle regulation and control hook, the atomizing nozzle and the filter pump are connected by virtue of a PVC hose, and a plant fixing device is arranged on the top of the
plant growth chamber.