An energy saving lamp, containing an isolated bulb set and assembling base, wherein the bulb set is comprised of a main body, a bulb and a lid, and the assembling base is comprised of a main seat, a circular wall, a ballast and a bottom lid. A conductive and assembling structure are provided between said bulb set and the assembling base such that the bulb set and the assembling base can be disassembled and re-assembled freely, thus making it feasible to replace the malfunctioned parts of the lamp, achieving in the purpose of lower cost and reparability.