The invention discloses a system for air purification, condensation, water production and water supply. The system comprises a water production and water supply unit, wherein the water production and water supply unit comprises a water production host, a water supply pipe network and a plurality of water supply auxiliary units, wherein a water outlet of the water production host is connected to the water supply pipe network by a water outlet electromagnetic valve, and water inlets of the water supply auxiliary units are connected to the water supply pipe network by water inlet electromagnetic valves; a control circuit of the water production host comprises a controller, a man-machine interaction module and a wireless communication module, and a wireless communication module of and the man-machine interaction module of the water production host and a control end of the water outlet electromagnetic valve are connected to the controller; a control circuit of each water supply auxiliary unit comprises a microcontroller, a man-machine interaction module and a wireless communication module, and the wireless communication module and the man-machine interaction module of the water supply auxiliary unit and a control end of the water inlet electromagnetic valve are connected to the microcontroller; and the wireless communication module of the water production host is in communication connection with the wireless communication modules of the water supply auxiliary units. According to the invention, the water production host can keeps on supplementing clean water to the water supply auxiliary units, and demands for water use of the water supply auxiliary units can be satisfied.