The suspended cable is a type pf commonly used tension structure in engineering structures. It has high flexibility and light damping, and it is prone to large vibrations under various excitations and/or support motions, which endangers the safety of the cable structures. The previous studies have shown that the vibration characteristics of the dynamic system are very sensitive to temperature changes. Therefore, this paper considers both the parametric resonances caused by the support motions and the two-to-one internal resonances, and then it systematically explores the influences of temperature changes on the suspended cable’s dynamic behaviors from the perspective of global bifurcations. Firstly, the tension variation coefficient is introduced, and the nonlinear differential equations of the in-plane motion of the suspended cable subjected to parametric excitation in thermal environments is established. The Galerkin method is used for discretization, and the multiple scales method is adopted to obtain the average equation of the nonlinear system in rectangular coordinates. Based on the coordinate transformation, the average equation is simplified into a normal form. The energy phase method is used to explore the multi-pulse chaotic dynamical behavior of the suspended cable when the temperature is changed. Through the zero-point condition of the energy-difference function and the range of attraction of the center point under the disturbance system, the excitation amplitude, damping coefficient and detuning parameters of the system are explored, and the Lyapunov exponents of the four-dimensional system are calculated. Numerical examples show that: temperature changes affect the generation of system’s Shilnikov-type multi-pulse orbits. The multi-pulse orbits may disappear considering temperature effects, and it causes the system’s chaotic motions transform into periodic motions. The dynamical system may exhibit distinct vibration behaviors in thermal environments.