With the continuous advancement of modern science and engineering technology, the importance of metal temperature measurement has become increasingly prominent for ensuring product quality, optimizing production processes, and ensuring safety. However, traditional metal temperature measurement methods often face challenges such as difficulty in online measurement and low measurement accuracy. To address these issues, this study proposes a non-contact metal temperature measurement method based on magnetic field coupling. First, the study analyzes an approximate linear relationship between the real part of the system′s equivalent impedance and temperature, thereby transforming the unmeasurable temperature changes into measurable system impedance. It provides a theoretical foundation for non-contact metal temperature measurement based on magnetic field coupling. Next, an equivalent model of the non-contact metal temperature measurement system is formulated. Its feasibility is evaluated through a three-dimensional finite element simulation using Ansys Maxwell software. Furthermore, the study proposes and compares two different types of eddy current sensors for temperature measurement, highlighting the multi-coil coupled structure for its compact size, high accuracy, and great stability. Based on this, a non-contact metal temperature measurement system using multi-coil coupling is proposed. The system modeling analysis and physical testing are conducted. The experimental results show that the absolute temperature deviation of the noncontact metal temperature measurement system based on the multi-coil coupling model is less than 2℃ , confirming the reliability and stability of the system. The system can operate stably without a direct visual path, overcoming the reliance on line-of-sight in traditional non-contact temperature measurement techniques. This advancement significantly improves the system′s performance and applicability, enabling precise, real-time measurement of metal temperature even in complex and obstructed environments.