New liberal arts refer to the reorganization of traditional liberal arts to realize the intersection and integration within liberal arts and between liberal arts and natural sciences. The characteristics of new liberal arts are mainly problem-orientation, cross-integration, new technology application and innovative development. Under the background of new liberal arts, the implementation of interdisciplinary education in foreign language majors is an effective way for local colleges and universities to promote the construction of "new foreign languages" and the training of interdisciplinary and applied foreign language talents. Based on the connotations of new liberal arts and interdisciplinary education, and in view of the institutional and cultural barriers to the planning and implementation of interdisciplinary education, this paper proposes an optimized path for the design and implementation of interdisciplinary education for foreign language majors in local colleges and universities: deepen the integration between foreign language majors and other disciplines, build a staged, multi-level talent training system, set up cross-discipline curricular groups, apply new technology to transform traditional teaching and learning methods, strengthen the construction of interdisciplinary education platforms and faculties, and establish a foreign language interdisciplinary education system guarantee mechanism.