A mobile solar energy system is disclosed, which comprises a case and a solar energy device received in a chamber of the case. A cover is disposed above the chamber. The solar energy device comprises solar panels and a controlling device, and a plurality of solar modules are disposed on the solar panels. A battery module electrically connected to the controlling device is connected to the solar panels so that, when the sunlight propagates through the cover to the solar panels, the solar energy can be transformed into electric energy for charging the battery module. Thus, the solar energy device can be put into a standard case and transported in the case by a means of transportation, which makes it convenient to move with improved mobility; and a pollution-free and noise-free power supply can be provided by the solar energy device, which makes it more competitive in the market.