Social media is an important tool for people to interact and communicate. It is widely used in project-based learning (PjBL) and is of great significance in promoting sustainable education. However, although research on the relationship between social media and PjBL has been conducted for many years, no relevant research has been found to summarize their relationship. This study aims to explore the background, impact and challenges of using social media for PjBL learning. This study adopts a structured systematic review process, through detailed searches of WOS, Scopus, EBSCO and ERIC, and selects research samples according to inclusion and exclusion criteria. A total of 23 studies that meet the criteria were included in this review. The results analyzed the impact of social media on PjBL and its influencing factors, revealing that social media effectively supports PjBL by facilitating real-time collaboration, resource sharing, and reflective discussions, thereby enriching the PjBL experience. Students reported increased motivation, improved teamwork, and enhanced digital literacy. However, challenges such as distraction, uneven participation, and privacy concerns were noted, highlighting the need for careful planning and clear guidelines. The study concludes that when strategically integrated, social media can be a powerful enabler of student-centered learning in PjBL and provide important support for sustainable education.