<p>With increasing economic inequality, the phenomenon of class conflict caused by social class classification is becoming increasingly apparent. Some researchers have delved into this issue, yet few studies have considered the impact of social class as a group identity on individuals, particularly the negative effects of low social class identity. Therefore, this study aimed to investigate the relationship between lower-class identity and class conflict while analyzing the chain mediating roles of competence stereotypes and intergroup envy. The participants were 725 lower-class in China who completed self-reported questionnaires on objective socioeconomic status, class identification, competence stereotypes about the high class, intergroup envy, and class conflict. The results indicated that lower-class identity was positively correlated with class conflict and the chain mediation between competence stereotype and intergroup envy is not valid. However, class identity can indirectly predict class conflict through the dual mediating effects of competence stereotypes and intergroup envy. This study explored the negative effects of lower-class identity. This exploration will aid in uncovering the underlying causes and mechanisms of class conflict and ultimately provide a scientific foundation for the development of policies and interventions.</p>