The dual-core smart electricity meter based on switching power supply of silicon carbide is an important attempt of novel technology in the engineering field, especially the power industry. In response to its lack of reliability testing standards, according to the existing smart electricity meter operating environment, combined with the characteristies of switching power supply of silicon carbide and the dual-core smart electricity meter, and the various stress analysis of the electricity meter, this paper proposes the reliability detection scheme and corresponding specific methods. The proposed detection scheme is of great importance to determine the reliability index of the dual-core smart electricity meter based on switching power supply of silicon carbide. In this way, the technology level of smart power grid is improved and the safe and stable operation of power grid is ensured.