University mottos have been demonstrated to convey educational philosophies, but few studies have investigated the educational philosophies reflected by university mottos from countries along the "One Belt, One Road" (OBOR) route, with applying the analytical approaches like text mining and natural language processing (NLP). This present investigation constructed a database of university mottos from 1,535 universities in 61 countries along the OBOR route and applied NLP technology to explore the similarities and differences of educational philosophies among the universities along the OBOR route. Methods of NLP used in this article included text mining, cluster analysis, and Latent Dirichlet Allocation (LDA) topic model. The social network analysis (SNA) model was used to further analyze the interconnection and exchange of educational philosophies expressed through university mottos. Based on the five identified topic categories, we concluded that countries along the OBOR route have the same basic educational philosophy for higher education but have different emphases due to cultural differences, such as the different emphases on virtue education, collectivism, and individualism. Education for sustainability is another focus of higher education philosophy reflected by the topic categories of university mottos, which is consistent with the United Nations Sustainable Development Goals, for example, quality education. In addition to demonstrating the BRI impact on educational philosophies of countries along the OBOR route, this present investigation could also contribute to the growing body of knowledge about international cooperation and communication of higher education under the framework of BRI, for a globalized, shared and sustainable education in the post-COVID era.