The invention discloses a fog-haze environment simulation experiment device. The device comprises a closed fog-haze tank, a fog-haze production system, a parameter measuring system and a high-voltage discharge model system, wherein the fog-haze production system comprises a fog production system and a haze production system, the outputs of the fog production system and the haze production system are communicated with internal of the fog-haze tank; the parameter measuring system comprises a fog-haze concentration monitoring device, a fog-haze particle size distribution monitoring device and a temperature and humidity sensor; the high-voltage discharge model system comprises an aluminum bar, an aluminum plate and/or an insulator; a high-voltage sleeve with a built-in high-voltage wire is communicated with the internal of the fog-haze tank, the aluminum bar, and the aluminum plate and/or the insulator are arranged in the fog-haze tank. The simulation for the fog-haze test environment with controllable condition and in different degrees can be realized through the device disclosed by the invention, and the device is equipped with data monitoring equipment for performing the high-voltage test, and the research on external insulation interference of various electrical equipment aiming at the fog-haze environment of China is promoted.