The invention provides a tea-leaf freeze drying method, which comprises the following steps of: testing the eutectic temperature X of tea leaves to be dried by using a eutectic point tester; putting the tea leaves into a tea-leaf vacuum freeze dryer for pre-freezing, setting the pre-freezing temperature to be 5 to 10 DEG C lower than the eutectic temperature X, wherein the temperature-reducing speed in the dryer is 2 to 5 DEG C per minute, and maintaining the temperature for 1 to 2 hours after reaching the set temperature; vacuumizing the dryer to between 1.5 and 20 Pa, and setting the dryingtemperature to a temperature of between 35 DEG C below zero and the eutectic temperature X and maintaining the temperature for 0.5 to 2 hours; raising the drying temperature to a temperature of between 15 and 35 DEG C under the same vacuum state, and maintaining the temperature for 2 to 5 hours; and stopping the vacuumization treatment of the dryer, slowly introducing nitrogen into the dryer until the air pressure in the dryer is between 0.105 and 0.11 MPa, maintaining the pressure for 2 to 5 minutes, and releasing the pressure to the normal pressure and finishing the drying process of the tea leaves.