A lamp structure for adjusting light to be a high beam and a low beam has a sliding seat which comprises one end installed a lamp component and another end installed an annulate guiding groove on outer surface thereof, and the guiding groove comprises a first groove segment and a second groove segment, and the two groove segments have the same curvature; a lamp seat which comprises a first space for the sliding seat restricting in the first space, and a first through hole which is bored through the lamp seat into the first space and is according to the guiding groove of the sliding seat; and a restricting component comprises one end inserted in the first through hole of the lamp seat to trace the guiding groove for restricting the moving of the sliding seat.