This article systematically elaborates on the conceptual connotations, research methods, and mechanisms of influence on negative emotions of "self-detachment" as a psychological regulation strategy. Research shows that compared to the "self-immersion" perspective, the "self-detachment" perspective requires individuals to review negative events from a third-person or observer's standpoint, reconstructing the meaning of events by maintaining psychological distance. Experimental studies have found that when subjects adopt a self-detachment perspective and contemplate the deeper meaning of events, negative emotional experiences are significantly reduced, an effect that has been validated in both adult and adolescent populations. The mechanism of action is primarily manifested in two aspects: first, it promotes individuals to adopt abstract, decontextualized cognitive processing methods, enhancing their ability to grasp the overall situation; second, it improves executive functions and other cognitive abilities, thereby improving problem-solving and stress-coping capabilities. The research suggests that the self-detachment strategy not only alleviates the direct impact of negative emotions but also helps individuals analyze the meaning of events from a broader perspective, providing effective psychological technical support for emotional regulation in daily life.