Abstract: Nanochitin, a plentiful and renewable biopolymer, has attracted considerable interest in the food industry due to its excellent physical and chemical properties. This paper initially outlines the sources, preparation methods, and structural properties of nanochitin, then focuses on summarizing its recent applications in food active packaging, emulsification stabilizers, functional factor carriers, other fields both domestically and internationally. Additionally, the paper utilizes bibliometric methods to conduct an in-depth analysis of the research hotspots pertaining to nanochitin within the food sector, projecting its future development trajectories. This paper aims to furnish insights for the comprehensive development and utilization of nanochitin.