The preparation of conductive ink has become one of the important technologies to accelerate the development of printed electronics. In recent years, conductive ink conforming to the ecological concept has gradually become a research hotspot. The research status, conductive mechanism and application direction of eco-conductive ink are summarized by analyzing and sorting the relevant literature. The eco-conductive ink can be mainly divided into two types: solvent-based ink and energy-curing ink, and the application of eco-conductive ink in smart packaging is summarized, such as printing flexible batteries, electronic interactive packaging, RFID tags, thin film switches, etc. These products provide strong technical support for intelligent interaction, information tracking and traceability, anti-counterfeiting and anti-theft in packaging.