Identity issues have been an area of focus in language learning motivation scholarship. However, the role of national identity in language learning motivation has not received sufficient attention. In response to the timely call for reflections on nationalism and language education, this study examines how political nationalism and cultural nationalism shape Chinese learners' motivation to learn Japanese. Our analysis suggests that cultural nationalism considerably enhances Chinese learners' motivation whereas the motivational impact of political nationalism is bifurcate. Our research helps illuminate the mechanism of the rooted L2 self and national interest in language learning motivation, especially in the Chinese context.