The invention discloses a solar power photovoltaic controller, which comprises a solar battery, a system power supply, a central integration processor, a light control voltage sampling circuit, a load switch circuit and a DC load. The solar battery provides energy source for the system power supply, and doubles as a light sensor for the system. The light control voltage sampling circuit feeds solar battery collection signal to the central integration processor to control the DC load by means of light. The invention is equipped with a protective circuit to prevent reverse charge, and a light control and sensitivity adjustment circuit. The protective circuit to prevent reverse charge charges the system power supply when exposed to light, and provides a high level sensing signal for the light control and sensitivity adjustment circuit through the light control voltage sampling circuit; and prevents the power system from reversely charging the solar battery when unexposed to light, and atthe same time, provides low level sensing signal for the light control and sensitivity adjustment circuit through the light control sampling circuit. The system works reliably and stably; the range of adjustment of light control sensitivity and working hour ingress/exit point of loads is very wide; adjustment is convenient and quick.