Abstract: An LED lamp structure includes a lamp body, a plurality of LED chips, a lens, and an expansion structure. The lamp body has a front side formed with a recess and a rear side formed with a plurality of radiating fins. A positive and a negative conducting wire are provided in the recess, and a metal foil is arranged between the positive and the negative conducting wire. The LED chips are mounted on the metal foil and electrically connected to the positive and negative conducting wires through wire bonding, so as to electrically connect to a plurality of wiring junctions. An encapsulating material is filled in the recess to complete packaging of the LED chips. The lens is mounted to the front side of the lamp body. A plurality of the lamp bodies can be connected side-by-side, end-to-end and/or back-to-back via the expansion structure to expand the LED lamp structure.