The invention relates to a method for machining tea, and in particular relates to a method for machining flower-fragrance black tea in a low-temperature compounding mode. The method comprises the following steps: spreading to cool high-fragrance type oolong tea with two to three fresh leaves on one bud as a raw material, finely manipulating the green tea leaves, kneading, thinly spreading, fermenting at high temperature and low humidity, and drying so as to obtain coarse tea; appropriately selecting to remove peduncles and pieces, highlighting the fragrance and thus accomplishing the machining. According to the flower-fragrance black tea machined by using the method, the weight loss of the green leaves in the machining process can be controlled, and the machining time is shortened, particularly under poor weather conditions; fragrant substances such as flower and fruit fragrance of alcohols, alkenes, esters and ketones are added, and the content of benzyl cyanide with pungent odor, indole and main fragrant substances, namely, nerolidol, in oolong tea, are increased, so that the fragrance and the taste quality of the tea are improved, and then the quality of the black tea is improved. Sensory evaluation on the finished tea shows that the finished tea is fat, strong, compact, black and tender in appearance, tea tips are visible, the fragrance is strong and heavy, the fragrance of flower and fruit appears, the taste is fresh and mellow, the bottom of a cup has the flower fragrance, and the quality is superior to that of black tea manufactured by using the conventional method.