A solar energy charger includes a solar energy collecting module, a controlling module electrically connected to the solar energy collecting module, an energy storing module electrically connected to the controlling module, and a switching module electrically connected to the controlling module and energy storing module. The energy storing module includes a first energy storing unit and a second energy storing unit. The solar energy collecting module is configured for converting solar energy into electrical energy. The controlling module detects electrical energy states of the energy storing units to output a detecting result, and the controlling module controls and switches the switching module to charge or discharge the energy storing units in turn according to the detecting result.