Abstract:The most important theoretical achievement obtained in the 19th National Congress of the Communist Party of China is the establishment of Xi Jinping's thought of socialism with Chinese characteristics in the new era, the fundamental guiding ideology of our Party for realizing the Chinese dream, the great rejuvenation of the Chinese nation. As the most important component of his thought of socialism with Chinese characteristics in the new era, Xi Jinping’s exposition on the working class and trade union work is the fundamental viewpoint and method of guiding the cause of workers' movement, providing the great cognitive instrument and guiding principles for deeply understanding the status and role of the working class and trade union work in the new era. In addition, it is also the great weapon of thought in promoting the innovation of trade unions in terms of its theory, system, and practice, providing an orientation in dealing with new issues of workers’ movement and ushering in the new situation of the cause of workers' movement.