The present invention relates to a street light power supply device, and in particular to provide a street light having a self-power and an automatic lighting function used as the power of the street light using solar energy.;The design of the solar cell frame to connect a plurality of solar cells directly, in parallel, the solar cell frame for supporting the plurality of solar cells, and to receive the maximum energy by varying according to the incident angle of sunlight A driving mechanism for adjusting an angle, a storage battery, charge and discharge control means for storing the voltage in the storage battery and preventing a reverse flow of current when the voltage generated by the solar cell is equal to or higher than a predetermined voltage; A power supply replacement control means for monitoring the voltage of the light source and turning on the horizontal light source from an external power source when the voltage is less than a predetermined voltage, ambient light sensing means for discriminating day and night, and turning off and on the street light source; Drive mechanism for controlling the rotation of the drive mechanism so that the solar cell receives the maximum energy It is configured to include a controller.
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