The invention discloses an air humidification device for potted plants. The air humidification device comprises a machine shell, a cultivation disc, a pair of gear rotating discs, an atomizing device, a water inlet, a water outlet, an air inlet, an air outlet, a fan, a water outlet cavity and a submersible pump, wherein the machine shell is of a cubic structure with an open top, the cultivation disc is arranged in the machine shell, the gear rotating discs are of cone structures, the atomizing device is arranged at the bottom of the machine shell, the water inlet is formed in one side surface of the machine shell, the water outlet is formed in the bottom of the machine shell, the air inlet and the air outlet are formed in the two opposite side surfaces of the machine shell respectively, the fan is arranged in the machine shell and is close to the air outlet, the water outlet cavity is arranged at the bottom of the cultivation disc and faces the top of the machine shell, and the submersible pump is arranged at the bottom of the machine shell. The air humidification device has the advantages that the structure is simple, the cost is low, the humidification effect is good, water sources can be saved, instant humidification can be realized, and the waiting time of a user can be decreased.