The risk of potential thermal shrinkage cracking caused by the significant increase in temperature due to hydration heat during the pouring and curing process of the concrete raft on the saturated soil layer after deep excavation cannot be avoided. This paper focuses on studying the variation of temperature field under the condition of significant fluctuation of soil moisture content caused by the nearby subway construction before the construction of a certain project. The simulation of temperature field control scheme was conducted, and the scheme was optimized on the premise of ensuring project safety. Through theoretical calculations and finite element simulation analysis, considering the uniqueness of the concrete pouring raft, a specific design of concrete hydration heat temperature control measures for the large-volume raft of this project was proposed, which can guarantee the strength of the raft and restrain the cracking of concrete caused by excessive temperature difference inside and outside. This paper analyzes the principles of heat conduction and the causes of concrete failure, simulates and analyzes the temperature field of large-volume concrete raft foundation using finite element method, and proposes an effective and precise cooling method for the hydration heat of pouring concrete raft on saturated soil after deep excavation, as well as cost control measures, to achieve effective cooling and energy saving and carbon reduction. It provides effective references for similar concrete raft projects in terms of temperature control technology to meet the carbon neutrality and carbon target policy.