In order to solve the problems that in the existing olive tea preparation process, the nutrition of olive leaves is ruined in the processes of high temperature deactivation, sun-curing, and alkali soaking, the olive leave, only the taste of ingredient remains after the olive tea is soaked, the obtained olive is not high-quality purely natural olive tea, and the unique health care function of the olive leaves can not be sufficiently exerted, the invention provides olive tea and a preparation process thereof. The olive tea is prepared by selecting old leaves, tender leaves or tender shoots of olives. The preparation process comprises the following steps of spreading, moisture preservation, tea washing, dewatering, steaming, forming, curing, storing, frying, rolling depression, secondary curing and screening. The olive tea and the preparation process thereof, which are provided by the invention, have the beneficial effects that branches sheared from olive trees are efficiently utilized, the old leaves, tender leaves or tender shoots are selected, and a certain proportion of olive flowers is taken as the raw material, so that the waste materials can be turned into valuable materials, and further, the profits of enterprises and farmer households are enhanced. The olive tea has the advantages that the preparation process of the olive tea is unique, the nutrition in the olive leaves is kept to the maximum extent, and drinking the olive tea for a long time has a health care effect on human bodies.