A pure traditional Chinese medicine composition for treating poultry infectious bursal disease and a preparation method thereof relate to a poultry medicine and a preparation method thereof. According to the pure traditional Chinese medicine composition and the preparation method thereof of the invention, the method comprises the following steps: (1) weighing, by weight, 15-25 parts of propolis which is processed by superfine comminution and sieved through a 500-mesh sieve, 10-15 parts of cinnamomum porrectum, and 15-25 parts of pomegranate rind, mixing for 5-10 min till the mixture is uniform; (2) weighing, by weight, 15-25 parts of lithospermum, 10-25 parts of mung bean, 10-20 parts of gynostemma pentaphylla, and 15-25 parts of isatis roots, mixing for 5-10 min till the mixture is uniform; (3) combining the mixtures prepared in step (1) and (2), continuing to mix for 10-15 min till the mixture is uniform. The beneficial effects of the invention are that: the formula is reasonable; the preparation is simple; the pure traditional Chinese medicine composition has no toxic or side effect, no pollution, no medicine residude, and no drug resistance, is treated by superfine comminution, has high bioavailability, and very significant curative effect, and is proved clinically to have special efficacy on treating poultry infectious bursal disease.