High and low temperature environmental simulation system

The invention discloses a high and low temperature environment simulation experiment system. The high and low temperature environment simulation experiment system comprises a high and low temperature experiment box, a gas replacement assembly, a fast heating and heat-preservation assembly and a fast cooling and heat-preservation assembly. The gas replacement assembly is used for replacing air in the high and low temperature experiment box with ultralow-dew point high-purity nitrogen. The fast heating and heat-preservation assembly is used for heating the interior of the high and low temperature experiment box to a required temperature and keeping the temperature in a certain time period. The fast cooling and heat-preservation assembly is used for cooling the high and low temperature experiment box to a required temperature and keeping the temperature in a certain time period. The high and low temperature environment simulation experiment system utilizes an air-bath vaporizer to supply a small flow of system nitrogen, the high and low temperature experiment box utilizes a wall compound-insulation method so that the operation can be carried out at a temperature of -120 to 170 DEG C, and circulating cooling and heating fans work respectively in appropriate temperature ranges so that circulating fan use reliability is guaranteed.