This study investigates the effect of magnetic field and viscosity on the behavior of thermoelastic fiber-reinforced porous solid materials using a 3PHL model. The study aims to understand how these factors affect the mechanical properties and thermal response of the material. The results will provide valuable insights into the design and optimization of these materials for various applications, such as in the aerospace and automotive industries. The findings from this study will contribute to ongoing research in the field of advanced materials and help in the development of innovative and efficient materials for practical use. Our study introduces a pioneering application of the 3PHL model to thermoelastic fiber-reinforced porous solids, integrating the effects of viscosity and magnetic fields for the first time. This approach provides a more nuanced understanding of the material behavior under varying operational conditions. Unlike traditional models, our framework accounts for the interactions between magnetic fields and viscosity, revealing new insights into the thermoelastic response of composite materials. This enhancement allows for more precise predictions of material performance in dynamic environments.