The present invention discloses stable abiraterone acetate tablets and a preparation method thereof. The tablets comprise an abiraterone acetate raw material and pharmaceutical auxiliary materials, wherein the pharmaceutical auxiliary materials comprise a filler, a disintegrating agent, a surfactant, a binder and a lubricant. The stable abiraterone acetate tablets are characterized in that the porosity of the tablets is less than 15%, the content of the pharmaceutical auxiliary material with the porosity of less than 70% in the tablets is more than 50 wt%, the content of the pharmaceutical auxiliary material with the porosity of more than 70% in the tablets is less than 10 wt%, and the pharmaceutical auxiliary materials do not contain silica and an antioxidant. According to the present invention, the tablet preparation can sequentially use granulation and tableting or uses a direct powder tableting process, wherein the hardness of the table is controlled at more than or equal to 15 kg during the tableting; and the stability of the abiraterone acetate tablets is significantly improved, the storage time is prolonged, and the potential toxic-side effect generated by impurity oxidation is reduced.