The invention relates to an ultrahigh-pressure water fog test system comprising a water fog box, a data acquisition and analysis control subsystem, a visible radiation detection unit, an infrared spectrum attenuation detection unit, an infrared thermal imaging detection unit, a 1.06-micrometer near-infrared laser attenuation detection unit, a 10.6-micrometer far-infrared laser attenuation detection unit, an air heating device, an air cooling device, a humidifying device, a dehumidifying device, an axial flow fan, an ultrahigh-pressure ultrahigh-rotate speed spinning nozzle, a temperature sensor, a pressure sensor, a humidity sensor, a wind speed sensor, a water fog concentration sensor and a particle size distributor. The system can simulate the atmospheric environment indexes, such as, atmospheric pressure, temperature, humidity, wind power, and the like in the water fog test box according to test requirements, carry out a shielding disturbance performance index test in the detectionways of visible light, laser, thermal imaging, infrared radiation and the like by aiming at ultrahigh-pressure water fog generated by an ultrahigh-pressure water-jet water fog cloaking generator and carry out analysis and evaluation.