Based on the experimental principle of Fourier thermal conductivity, in this paper an open dynamic metal thermal conductivity experimental measuring device is independently designed and developed. Through systematic analysis of the experimental measurement results and errors, the theoretical improvement model and corresponding experimental measurement methods for further improving the experimental measurement accuracy are given. The relevant experimental equipment, contents and principles have certain reference significance for college physics experiment teaching. The equipment can be used not only for physical experiment teaching and scientific research practice, but also for industrial measurement practice under open conditions.