The invention relates to a solar power supply medical platform device allowing the inclination angle to be adjusted accurately and an adjusting method thereof. The device comprise a supporting frame (6), a bearing platform (9), an adjusting platform (8) and a driving gear (7), wherein the bearing platform (9) is in pivot connection with the supporting frame (6), the adjusting platform (8) is located below the bearing platform (9) and is in pivot connection with the supporting frame (6), and the driving gear (7) is arranged below the adjusting platform (8) and meshed with an adjusting gear segment (81) at the lower side of the adjusting platform (8); the driving gear (7) is driven by a driving motor (77), the driving motor (77) is fixedly connected with the supporting frame (6) through a support (76), and a storage battery (15) is fixedly arranged on the portion, at the left side of the driving motor (77), of the support (76) and is electrically connected with the driving motor (77); the storage battery (15) is electrically connected with a solar panel, and an inverter is connected between the solar panel and the storage battery (15), so that solar energy is converted into electric energy through the solar panel, the electric energy is stored in the storage battery (15) to supply power to the driving motor (77), and energy is saved.