To what extent does China's domestic nationalism influence the evolution of China's diplomatic discourse from 2012 to 2025? This study focuses on the main features of domestic nationalism in China in the Xi Jinping era. It seeks to unravel the internal and external reasons for the emergence of radical nationalism. This study will be embedded in neo-classical Neoclassical Realism, seeking to analyse the influence of China's domestic nationalism on the change in China's diplomatic discourse, and to evaluate the polarisation of China's diplomatic discourse from 2012 to 2025.