The invention relates to a spiral outer-arc bulb lamp structure which comprises a lamp holder, a lampshade, a supporting frame and a central pillar, wherein the supporting frame is composed of a base plate and a plurality of radiating supporting chips; the radiating supporting chips are vertically fixed on the base plate; a limiting table is arranged at the upper end of each radiating supporting chip; each radiating supporting chip is arrayed in a spiral form; the radiating supporting chips are of outer-arc shape from top to bottom; a through hole which is communicated with an electric appliance mounting slot in the lamp holder is formed in the central pillar; a connecting pillar made of rubber is arranged at the lower end of the central pillar; four way-giving slots are formed in the middle lower part of the connecting pillar; a clamping slot is formed in an annular surface on the middle part of the connecting pillar; an arc-shaped pressing block is arranged at the lower end of the lamp holder; a limiting mounting slot is formed in the arc-shaped pressing block; the central pillar is located in the radiating supporting chips. The spiral outer-arc bulb lamp structure has the advantages of compact structure, convenience in assembling and attractive appearance; the spiral outer-arc bulb lamp structure can immediately emit the heat of an LED (Light Emitting Diode) lamp, so that the radiating effect is obviously enhanced, the use reliability is increased, and the service life of the LED lamp is ensured; the wiring arrangement of the LED lamp is standard.