An outdoor solar disc lamp includes a translucent lampshade mounted on a base, the translucent lampshade has a top translucent portion and a side translucent portion around the periphery of the top translucent portion, a solar panel is installed between the base and the translucent lampshade and above a battery, and a circular light panel surrounds the periphery of the battery and has a height lower than the solar panel, such that the circular light panel can emit light toward both the top translucent portion and the side translucent portion of the translucent lampshade.