The invention discloses an LED lamp device. The LED lamp device comprises a lamp holder part and a lamp head part matched with the lamp holder part, an inserting groove with a downward opening is formed in the lamp holder part, first sliding grooves which extend upwards and downwards are symmetrically arranged in the lamp holder part on the left side and the right side of the inserting groove, a second sliding groove is formed in the lamp holder part above the inserting groove, a third sliding groove which extends leftwards and rightwards is arranged in the lamp holder part above the second sliding groove, a sliding table is arranged in the inserting groove in a sliding mode, first racks are symmetrically arranged on the end surfaces of the left side and the right side of the sliding table, first sliding blocks are arranged in the first sliding grooves in a sliding mode, second racks are arranged on the inner side end faces of the first sliding blocks, and rotating cavities are formedbetween the inserting groove and the first sliding grooves.