Sand hole leakage defect simulation test device and oxygen leakage concentration detection method

The invention relates to a sand hole leakage defect simulation test device and an oxygen leakage concentration detection method. The device comprises a mixed gas supply module, a first pressure balance adjustment module, a second pressure balance adjustment module, a sand hole leakage defect simulation module, a ventilation module and a plurality of gas on-off control structures connected with all the modules, the sand hole leakage defect simulation module comprises a closed cavity and a sand hole leakage defect shell, a temperature and pressure measurement unit, a cooling unit, a heating unit and a capillary tube unit which are located in the closed cavity, the temperature and pressure measurement unit is connected to the outer wall of the top of the shell, the cooling unit is tightly attached to the outer wall of the shell, and the heating unit is located in the shell; the capillary unit extends into the shell from the bottom of the shell and is communicated with the shell. Compared with the prior art, the