The internationalist principle of the proletarian party，accompanied by the whole historical process of its birth，development and growth，is an important revolutionary principle and magic weapon for the leadership of the proletarian party to promote scientific socialism from theory to practice and from one country to many countries.Since its founding，the Communist Party of China has clearly adhered to the principle of internationalism.In her great theoretical and practical process of leading the Chinese revolution，construction and reform and opening up，she has always insisted on inheriting and carrying forward the internationalist principle of the proletarian party，and has continuously endowed this principle with new connotations.This has also enabled China's revolution，construction，reform and opening-up to continue to achieve new victories.Contemporary Chinese Marxism stands in the field of the new era.In the theory and practice of promoting the construction of a new party system，a new type of party relations，“The Belt and Road” cooperation initiative，the construction of a new type of diplomatic relations between major powers and the construction of a community of human destiny，it endows the proletarian party internationalism principle with a new connotation of the times，thus demonstrating its profound ideological and theoretical value，lasting social and historical value and distinctive value of the times.