Coffee tea and preparation method of coffee tea

The invention discloses a coffee tea and a preparation method of the coffee tea. The preparation method comprises the following steps: mixing big-leaf sun-dried tea, coffee beans and green tea according to different proportions, carrying out ultrasonic sterilization for about 10 minutes, crushing and grinding the mixture into fine powder with the fineness of 0.02 mm or below, adding purified water, conducting sufficient mixing according to a weight ratio of 1: 1, standing at normal temperature (15 DEG C to 25 DEG C) for 60 minutes, putting the above mixture into a high-pressure extruder, and sufficiently extruding effective components in the mixture; then conducting filtration by using a filter screen (with the fineness no more than 0.02 mm), removing solid residues, leaving water-solublemixed crystals, injecting purified water (with the temperature between 15 DEG C and 25 DEG C) according to the ratio (designed according to the product shape and density requirements) of the mixed crystals to water being 1: 6