The application of edible coatings to dried products such as silkworms (Bombyx mori) is an innovative method for preserving nutrients during drying process. These coatings are made from safe, natural ingredients such as carboxymethylcellulose (CMC), nano cellulose fibre (NCF), nano chitosan (N-Ch), and varying concentrations of green pomelo peel essential oil (GPO). The results revealed that the addition of GPO into coating/film significantly changed the pH, viscosity, and TSS values of the coating solutions while reducing film weight loss, particularly in the CCG3 film (61.93%). CCG3 also showed the strongest antibacterial effect against "Staphylococcus aureus" and maintained lower silkworm moisture content compared to other samples. Metabolic analysis revealed that certain compounds, such as 2-Hydroxyglutaric acid-3TMS and malic acid-3TMS, were more robust in CCG3. X-ray CT image analysis using image processing technology showed high accuracy, with the porosity area in the CCG3 sample being greater. These findings highlighted the potential application of edible coating in drying process to protect the nutrients of dried products.