The invention discloses a highway green environment-friendly dust-reduction spraying vehicle comprising a cab, wherein a control system is arranged in the cab; a vehicle body with a water storage tankarranged above the vehicle body; a cover body is arranged above the water storage tank; the cover body includes a first cover body and a second cover body. The first cover body is a conical cover body, and the second cover body is a square annular cover body which is composed of four sub-cover bodies connected end to end. The sub-cover bodies are foldable and rotatable along the edge of the waterstorage tank and are connected with and fixed to the water storage tank. A self-generating mechanism comprises a solar cell sheet and a battery; a filter mechanism comprises a filter screen and a filter layer; the filter screen is detachably arranged between the first cover body and the edge of the water storage tank; the filter layer is arranged below the filter screen; a spraying mechanism comprises a water pump, a rotating shaft and a spraying head; and the vehicle further includes a driving mechanism and drive wheels. The invention is convenient for the recovery and treatment of rainwater, and realizes the spray dust reduction of the highway by using the solar energy and the purified rainwater, thus saving the use of the energy and protecting the environment.