Disclosed is a multifunctional indoor decontaminating plant wall. The plant wall comprises a plant module installed on a three-dimensional support frame. A circulating filtration water supply system, a humidification system, a ventilation system and a light supplement system are further installed on the three-dimensional support frame. The circulating filtration water supplying system comprises a water tank, a water pump, a water supply pipeline, a drop irrigation pipe, a filter and a water level controller. The water pump and the filter are transversely arranged in the water tank; a water inlet of the water pump is connected with the filter through a water pipe, and a water outlet is connected with the water supply pipeline; the water supply pipeline is connected with the drop irrigation pipe which is horizontally arranged at the top of the plant module upwards; and the water level controller is arranged on the upper portion of the water tank. The humidification system is composed of an atomizer arranged in the water tank, the ventilation system comprises a fan vertically arranged on one side of the three-dimensional support frame, an air outlet of the fan faces the plant module, and the light supplement system is composed of light supplement lamps and a power supply rail. The multifunctional indoor decontaminating plant wall can purify the indoor air, adjust the humidity and beautify the wall and can be widely applied in buildings of markets, hotels, movie theaters, exhibition halls, houses and the like.