The utility model discloses a solar street lamp battery box, its structure includes concrete foundation, base, ring flange, lamp pole, connecting rod, solar rack, solar cell panel, battery, drainage device, lamp pole head, lamp holder, LED lamp, controller, support frame, concrete foundation and base fastening connection, the ring flange is established on the lamp pole, connecting rod and solar rack fastening connection, solar cell panel is connected with the battery, the battery is established in drainage device, drainage device comprises box, water drainage tank, inner groovy, outer bottom plate, backup pad, the box is equipped with water drainage tank on with, the LED lamp is connected with the controller. The utility model discloses be equipped with drainage device, can be through the cooperation of water drainage tank and inner groovy, better guide rivers are discharged, effectively prevent steam getting into the inside, the improved circuit security.