The breviscapine sustained-release capsule and a preparation method thereof relate to a medicinal dosage form and a preparation process of a traditional Chinese medicine breviscapine sustained-release capsule. Capsules include the active ingredient scutellarin, blank ball cores and adhesives for adhering scutellarin powder to the blank cores and a coating layer for surface sealing. The adhesive and coating layers are made of polyvinylpyrrolidone Composed of ethyl cellulose, each capsule contains 60mg of breviscapine. During the preparation, the blank ball core is put into a coating granulator, scutellarin powder is added, and an adhesive is sprayed at the same time to make medicine-containing pellets, which are then sealed on the surface to make slow-release capsules. The present invention overcomes the disadvantages of poor dissolution rate and short drug action time of the original tablet form, can reach the required effective blood drug concentration in a short period of time, and can maintain the required blood drug concentration in a long period of time. High, reducing the daily dosage and frequency, only need to take twice a day, one capsule each time, it is a good maintenance drug for patients with coronary heart disease, angina pectoris, myocardial infarction and so on.