The utility model discloses a movable defoaming agent spraying device which comprises a water tank, an electric stirrer, a screw pump, a spraying device, a vehicle-mounted generator and a plurality ofdefoaming agent storage tanks which are arranged in a vehicle hopper, the electric stirrer comprises a motor and a transmission which are arranged on the top surface of the water tank, and a stirringdevice which is arranged in the water tank from a mounting hole in the top of the water tank; a liquid inlet of the screw pump is communicated with a liquid outlet of the water tank through a liquidconveying pipeline, and an opening and closing valve is arranged on the liquid conveying pipeline; a liquid outlet of the screw pump is communicated with the spraying device through a liquid conveyinghose; the vehicle-mounted generator is respectively connected with the screw pump and the electric stirrer through power lines; the movable defoaming agent spraying device is simple in structure, lowin cost, convenient to install and easy to operate, the whole device is integrally installed on a pickup truck hopper, good maneuverability is achieved, the defoaming efficiency is improved in a spraying mode, the problem that the speed of manually adding a defoaming agent is too low is solved, and the requirement for rapid defoaming on different sites can be met.