Plasmacytoid dendritic cells (pDCs), a subtype of DC, possess unique developmental, morphological, and functional traits that have sparked much debate over the years whether they should be categorized as DCs. The digestive system has the greatest mucosal tissue overall, and the pDC therein is responsible for shaping the adaptive and innate immunity of the gastrointestinal tract, resisting pathogen invasion through generating type I interferons, presenting antigens, and participating in immunological responses. Therefore, its alleged importance in the gut has received a lot of attention in recent years, and a fresh functional overview is still required. Here, we summarize the current understanding of mouse and human pDCs, ranging from their formation and different qualities compared with related cell types to their functional characteristics in intestinal disorders, including colon cancer, infections, autoimmune diseases, and intestinal graft-versus-host disease. The purpose of this review is to convey our insights, demonstrate the limits of existing research, and lay a theoretical foundation for the rational development and use of pDCs in future clinical practice. pDCs are a subset of dendritic cells, and transcription factors play a crucial role in the process. pDCs contribute to intestinal immune responses by generating interferon (IFN) and presenting antigens. pDCs guard the intestinal mucosa and protect against the invasion of microbiota and pathogens in the gut, playing a pivotal role in gut infection and colon cancer.image pDCs are a subset of dendritic cells, and transcription factors play a crucial role in the process.pDCs contribute to intestinal immune responses by generating interferon (IFN) and presenting antigens.pDCs guard the intestinal mucosa and protect against the invasion of microbiota and pathogens in the gut, playing a pivotal role in gut infection and colon cancer.