The invention discloses a lamp device. The lamp device comprises a lamp holder, a light source, a color disk, and a lens, wherein the lamp holder is provided with a plurality of cooling fins; the light source is arranged in the lamp holder; the color disk is located above the light source and is in contact with the lamp holder; and the lens is movably arranged on the lamp holder. The light emitted by the light source passes through the color disk to form colored light, and then the colored light passes through the lens to form a light beam; and the heat generated by light emission of the light source and the heat generated by the light passing through the color disk are dissipated by the cooling fins.