Abstract: An adjustable angle solar power generation system that can decrease a tilt control angle of a solar panel without narrowing a range where the sun is tracked. The system includes a supporting portion that supports a solar panel to be capable of being tilted within a range in which the solar panel is tilted at an arbitrary angle in only one direction from a horizontal state, and a revolving portion that supports the supporting portion from below so as to be rotatable around a vertical axis. The revolving portion supports the supporting portion so as to be rotatable in such a manner that a tilt range of the solar panel is reversed with the vertical axis being defined as a symmetric axis, enabling the solar panel to tilt in both directions within the same range before and after the rotation of the revolving portion.