The invention discloses a preparation process of mulberry leaf tea. The preparation method includes the following steps: (1), after fresh mulberry leaves are picked, spreading the fresh mulberry leaves uniformly for placement indoors for 1-2 days, removing water at 150-200 DEG C, rolling, using gross fire to fry the fresh mulberry leaves to be 70-80% dry, spreading for cooling, using complete fire to dry-fry for flavoring until the fresh mulberry leaves are completely dry, and smashing to obtain mulberry leaf powder; (2), after chrysanthemum is cleaned, placing chrysanthemum into ozone water for soaking for 20-30 minutes, performing low-temperature vacuum drying, removing water, and smashing to obtain chrysanthemum powder; (3), placing podocarpus leaves into a refrigeratory of minus 10 DEG C for refrigerating for 4 hours, placing the same into a refrigeratory of minus 30 DEG C for freezing for 1-2 hours, taking the same out, adding water for pulping, filtering, and drying to obtain podocarpus leaf powder; (4), mixing the mulberry leaf powder, the chrysanthemum flower and the podocarpus leaf powder well to obtain mixed powder, spraying essential oil onto the mixed powder, drying, performing superfine smashing, and packaging, wherein the essential oil accounts for 0.1-0.5% of weight of the mixed powder. By the preparation process, smell and green taste of the mulberry leaves are effectively removed, cool nature of the mulberry leaves is improved, stomach cold is avoided, and the mulberry leaf tea has multiple healthcare functions.