The invention discloses a simulated fog control system and method for a corona cage test, and the system comprises a fog pump station group unit, a pressure conveying unit, a fog nozzle unit and a field control unit, wherein the fog pump station group unit is configured to raise the water pressure of the water stored in a water tank to the high pressure through a high pressure pump station, and output the high-pressure water to the pressure conveying unit; the pressure conveying unit is configured to convey the high-pressure water output by the fog pump station group unit to the fog nozzle unit through a preset pipeline; the fog nozzle unit comprises a plurality of high-pressure micro-fog nozzles and is configured to generate fog particles of a predetermined size; and the field control unit is configured to set parameters of the system, and monitor and control the system. The system and method satisfy the condition of simulating foggy weather in the outdoor target area of the corona cage in any environment through a method of artificially simulating fog, and realize a fogging simulation that can control the concentration of the fog particles.