The invention discloses a special SoC chip for controlling a stand-alone photovoltaic LED illuminating system, which comprises a charge sample circuit, a charge driving circuit, an LED illumination sample circuit, an LED illumination driving circuit, a control module, a temperature sensing circuit and a protection circuit. The input end of the charge sample circuit is respectively connected with a solar battery and a storage battery, while the output end is respectively connected with the charge driving circuit and the control module; the LED illumination sample circuit provides constant current for an LED lamp by controlling a power converting circuit; the charge driving circuit controls the power converting circuit to provide suitable charge current and voltage; and the LED illuminationdriving circuit controls the LED lamp to work after receiving illumination information provided by the control module. The chip can easily form the stand-alone photovoltaic LED illuminating system through a few periphery components, and the system has the advantages of low cost, high efficiency, small volume, high intellectualization and the like.