Shiitake mushrooms are nutritious but spoil quickly after harvest due to their high water content and lack of protective skin. This review explores how melatonin and various preservation methods like proper cooling, special packaging, and drying can extend shelf life and maintain quality. Different techniques work by controlling moisture, slowing respiration, preventing browning, and controlling microbial growth. Combining multiple methods, such as vacuum cooling with special packaging, provides the best results for preserving the mushrooms’ taste, nutrition, and appearance.