The invention discloses a high-temperature high-pressure pit shaft annular sealed space temperature and pressure change simulation experiment device, which comprises an upper end cover, a center pipe, an outer tube, a lower end sealed work tube, a sealing rod, an electric heater, a temperature and pressure sensor a, a temperature and pressure sensor b and a choke plug, wherein the electric heater is arranged in the center pipe; the center pipe is arranged in the outer tube in a sleeving way in a coaxial installation mode; the upper end cover is fixedly connected with an upper end opening of the outer tube and an upper end opening of the center pipe at the same time; the lower end sealing work tube is connected with a lower end opening of the outer tube; the temperature and pressure sensor b is used for monitoring the temperature and the pressure in a sealed space b of the center pipe; and the temperature and pressure sensor a is used for monitoring the temperature and the pressure in an annular sealed space a in the outer tube. The simulation experiment device can be used for accurately monitoring the temperature and pressure change of the sealed spaces after the heated expansion; and the simulation experiment device can also be used for monitoring the stress and strain change values of the center pipe and the outer tube after the sealed spaces are expanded through being heated.