Marx and Engels’ peace thought is vital to Marxist theory. They used historical materialism and materialist dialectics as world outlook and methodology to study peace. They analyzed the root and nature of war, revealed various ways to achieve peace under different conditions, and made a blueprint of a permanent peaceful world of the future human communist society. In the face of major changes in the current world unseen in a century and the increasing uncertainty and instability in China’s security, it is highly valuable that we deeply study Marx and Engels’ peace thought again. Using Marxist standpoints to rationally analyze the domestic and international situations help us comprehensively and accurately grasp the theme of the times. It is of practical significance to strengthen the peaceful development concept, actively build a community with shared future, and continuously realize the great rejuvenation of the Chinese nation.