Abstract: The “microwave transmission characteristics” of the repeater can compensate for the application limitations of fiber optic transmission repeater, but it also increases the number of error terms, resulting in limited communication guarantee for production and scheduling. In order to increase the reliability and stability of the microwave network in open-pit mines, vector calibration methods and protection strategies for open-pit mine microwave networks are studied. Based on the special environment of open-pit mines and the transmission characteristics of microwave networks, scattering parameters are selected as calibration indicators. This paper constructs a microwave network error model for open-pit mines based on 4n term errors, obtains the microwave network error term for open-pit mines, corrects the measured scattering parameters based on the error term, eliminates the error term, obtains scattering parameters that reflect the true characteristics of the open-pit mine microwave network, and achieves microwave network vector calibration. It develops microwave network protection strategies for open-pit mines from the aspects of physical protection, signal protection, and security protection, providing strong guarantees for the safe operation of microwave networks in open-pit mines. The experiment shows that this method can effectively achieve vector calibration of microwave networks in open-pit mines, and the protection strategy significantly improves the reliability and stability of microwave networks.