The invention relates to the technical field of processing of tea leaves, and in particular relates to a preparation process of mixed floral fragrance type Liuan guapian tea picked before grain rain.The preparation process comprises the following steps: 1, selecting tea leaves, 2, performing manual withering, 3, performing de-enzyming, 4, performing mixing and rolling, 5, performing deblocking and strip tidying, 6, performing air separation, 7, performing primary drying, 8, performing stir-frying, 9, performing color selection, and 10, performing fast baking with high-temperature carbon fire,storage and the like; the preparation process improve the processes of de-enzyming, rolling, drying and the like, a proper amount of fresh sweet-scented osmanthus is added in the rolling process, andthe flower fragrance is fused into the tea leaves in a rolling mode; the production efficiency of the green tea is improved, the floral fragrance type Liuan guapian tea is obtained, and the taste, shape and mouthfeel of the tea is not influenced, therefore, the economic benefits of the production of the Liuan guapian tea are improved.