Abstract: This invention is the safe street light capable of separating lamp unit and rotating arm designed for preventing the lamp unit from dropping in the lamp unit dropping and rising from the ground for exchanging electric bulb and repairing the lamp unit, and being attached to the pole of the street light firmly, and rotating the arm to work facilitating part, and this invention is installed at the pole of the street light fixedly set up vertically to the ground, and installed on the rotating device turning the arm forming parallel to the ground on the top street light and the above pole of street light, and equipped with the hold attaching device raising and dropping the above lamp unit from the ground, capable of minimizing the safety accident of the operator in repairing and maintenance work, and maximizing operation efficiency.