The invention relates to Gaoshan Taiwan oolong and a processing preparation method thereof (the production technology capable of keeping green and red in the whole process). The preparation method of the Gaoshan Taiwan oolong comprises the steps of tea harvesting, withering, twisting, fermentation, primary baking, heaping for yellowing, secondary baking, picking, blowing of fresh wind, warehousing, re-firing, fragrance enhancing and packaging. By the adoption of the Gaoshan Taiwan oolong, matter contained in fresh tea leaves is transformed reasonably and fully, little low-boiling-point fragrant matter is lost, and the content of theaflavin called as human body soft gold is high. The product is curled, compact and uniform in appearance, and black and glossy in color and luster, and has the delicate floral note of high-grade oolong and strong ripe fruit fragrance of special-grade black tea, the tea soup is mellow, fresh and smooth, has no fire smell or smoky flavour, is not cold or cool or hot or dry, and has the golden yellow and bright color, and infused leaves are fleshy, red and bright. The taste and sense of the Gaoshan Taiwan oolong (particularly Gaoshan Taiwan oolong produced in Shouning Country, eastern Fujian Province) are better than those of common Taiwan oolong.