The invention discloses a mobile activated water spraying device for haze governance. The mobile activated water spraying device comprises a water inlet pipeline, a gas inlet pipeline and a control box, wherein the water inlet pipeline and the gas inlet pipeline are both connected onto an annular nozzle, and the control box receives and controls water pressure of the water inlet pipeline and gas pressure of the gas inlet pipeline in real time. With the adoption of the annular nozzle, layout of spray nozzles is realized, and the requirement for umbrella-shaped coverage of sprayed water mist ismet; by means of double-flow and dual-pressure hybrid, particle size of the sprayed water mist ranges from 5 mu m to 20 mu m while spray power is guaranteed; spray strength and spray water flow of thespraying device are controlled by pressure buffer equipment; two precision filter devices are adopted to filter activated water, so that a spray water source is pure and fine, the spray nozzles are prevented from being blocked, and cruising power of the device is guaranteed.