With the rapid development of live-streaming e-commerce, real-time bullet curtain interactions have become a key factor influencing consumers’ purchase intentions. Based on the Media Dependency Theory, this study constructs a theoretical model of “bullet curtain interaction—social presence—purchase intentions” and investigates the impact mechanism of bullet curtain interactions on consumers’ purchase intentions by analyzing their three-dimensional characteristics: quantity, quality and emotion. A questionnaire survey was conducted to collect 217 valid responses for empirical testing.The results indicate that the quantity, quality, and emotion of bullet curtain interactions positively influence both social presence and consumers’ purchase intentions. Furthermore, social presence not only directly enhances purchase intentions but also plays varying degrees of mediating roles in the relationship between different dimensions of bullet curtain interaction and purchase intentions: it exhibits a full mediation effect on the influence of bullet curtain quality, while demonstrating partial mediation effects on the influences of bullet curtain quantity and emotion.