The invention discloses a wind / water linkage spraying and dust falling device. The device consists of a pneumatic triple piece, a self-locking button, a two-position five-way reversing valve, a pneumatic ball valve, a check valve, a filter and a nozzle, wherein the compressed air is fed into the self-locking button and the reversing valve through the pneumatic triple piece. When the spraying is required, the self-locking button is pressed, one channel of the compressed air enters a static pressure water pipeline through the check valve, the reversing valve is reversed through the other channel, the pneumatic ball valve is opened, and the compressed air and the static pressure water enter the nozzle through the filter and the pneumatic ball valve and form the mist to be spayed out. When the spraying is not required, the self-locking button is unlocked, the compressed air is cut off, the reversing valve is reset, the pneumatic ball valve is closed, the water channel is cut off and the spraying stops. By the aid of the device, the liquid sprayed by the nozzle forms the mist effect, the liquid is combined with the dust completely, the dust falling effect is good, the compressed air serves as the switching power, and the labor intensity is reduced.