<p>This paper describes the use of the ABAQUS finite element numerical simulation method to study the temperature field and deformation behaviors of an underground utility tunnel under seasonal variations in the ambient temperature. The effects of the ambient temperature on the temperature field and vertical deformation are comprehensively investigated. The numerical analysis results indicate that the temperature field inside the underground utility tunnel successively exhibits several special phenomena during the process of heating and cooling, namely a “low-temperature funnel” followed by a “cold core” zone, and then a “high-temperature funnel” followed by a “hot core” zone. These phenomena gradually appear and disappear over the continuous heating and cooling cycle. Under seasonal variations in ambient temperature, the vertical settlement deformation of the comprehensive cabin roof is significant, while the power cabin roof exhibits a small upward bulging deformation. The research results presented in this paper provide a reference for future research on the engineering behaviors of underground utility tunnels constructed in areas that are prone to seasonal freezing.</p>