The invention discloses a device for enhancing photovoltaic power output under different time scales based on probability density fitting, and belongs to the technical field of photoelectricity. The device is composed of a light collecting plate (13), a light scattering plate (2), a solar cell panel (30) and a fixed frame (14) and is characterized in that the light scattering plate (2) is made of glass and comprises a light scattering channel (1) and a light scattering plate body (3), the light scattering channel (1) is a groove carved when light is scattered on the light scattering plate body (2) and provided with a reflecting silver layer (6), and the light scattering plate body (3) is arranged at the position, around the groove, below the reflecting silver layer (6); the light collecting plate (13) is made of glass, 5-15 light collecting hemispheres (11) are arranged on the upper surface of the light collecting plate (13), the inner walls of the upper half portions of hemisphere lower cavities (12) are plated with silver, mirror faces are formed, and the lower half portions of the hemisphere lower cavities (12) are transparent. The device for enhancing photovoltaic power output under different time scales based on probability density fitting is easy to manufacture, high in operability, low in cost and obvious in effect.