Following the resumption of diplomatic relations between Saudi Arabia and Iran, many international scholars began to explore the role of China in the Russo-Ukrainian war. However, it is still difficult for China to play the role of mediator. Firstly, the Russian-Ukrainian war is by its very nature a proxy war, with the US’s strategic goals to weaken Russia economically and make European countries more dependent on the US militarily. China will not be able to reverse US strategic objectives until the US domestic environment changes. Secondly, as China is a long-term challenger to US hegemony at its core, the US also wants to worsen China’s relationship with the EU by tying China and Russia together through the Russo-Ukrainian war. The EU does not have confidence in China’s neutrality in the Russo-Ukrainian war. If China wants to mediate the Russo-Ukrainian war, it must win over the EU and seek a consensus, so that both sides can force the US and Russia to act prudently on the Russo-Ukrainian war.