The invention relates to a simulated reaction device for in-situ heat treatment coupled microbial remediation of a contaminated site, which is characterized in that organic contaminated soil is buried in soil in a sandbox at a left
pollution plume position, simulated underground water is set, the flow velocity of the underground water is controlled, and microorganisms and biological stimulants are injected; soil and
sewage are heated in a mode of directly injecting hot water or heating a
resistor, external hot water is controlled or the temperature is controlled within a preset range by a temperature controller, and the temperature detected by a
thermocouple is regularly recorded and stored by a multi-path temperature inspection instrument; the multi-position sampling detection is effectively used for simulating the remediation process of site organic
pollutant thermal coupling microorganism remediation specific pollutants, the influence of microorganisms and temperature environment on the site remediation process is explored, and the influence of different environment temperatures and microbial
population conditions on the concentration and distribution of soil organic matters can be intuitively known; the method is beneficial for guiding law and mechanism exploration of
thermal coupling microorganism remediation of organic contaminated soil in an actual
engineering site, and then the site remediation effect is improved.