An illumination device comprising a housing; a power supply module mounted on the housing; at least one storage bin disposed on the housing and at least one light source module, the number of light source modules not exceeding the number of storage bins, the light source module comprising: a luminescent component including a substrate and at least two luminescent units disposed on the substrate, the at least two luminescent units being arranged along a circular ring; and a light distribution component including an optical element provided with an annular lens and a mounting part encircling the annular lens and being connected with the optical element and the substrate, the lens receiving emergent light of the at least two luminescent units and emitting the light after light distribution; and the mounting part being bonded to the substrate and configured to fix the optical element above the at least two luminescent units, so as to adjust illuminating light emitted by the luminescent units through the optical element and a power drive unit disposed on the substrate, the drive unit being electrically connected with the luminescent units and configured to adjust current provided for the luminescent units, wherein the storage bin is configured to accommodate the light source module wherein the number of storage bins is at least two, a number of the light source modules is at least two; the light source modules are detachably accommodated into the storage bins and the light source modules are respectively electrically connected with the power supply module which is at least partially extended into the storage bins. a housing; a power supply module mounted on the housing; at least one storage bin disposed on the housing and at least one light source module, the number of light source modules not exceeding the number of storage bins, the light source module comprising: a luminescent component including a substrate and at least two luminescent units disposed on the substrate, the at least two luminescent units being arranged along a circular ring; and a light distribution component including an optical element provided with an annular lens and a mounting part encircling the annular lens and being connected with the optical element and the substrate, the lens receiving emergent light of the at least two luminescent units and emitting the light after light distribution; and the mounting part being bonded to the substrate and configured to fix the optical element above the at least two luminescent units, so as to adjust illuminating light emitted by the luminescent units through the optical element and a power drive unit disposed on the substrate, the drive unit being electrically connected with the luminescent units and configured to adjust current provided for the luminescent units, wherein the storage bin is configured to accommodate the light source module wherein the number of storage bins is at least two, a number of the light source modules is at least two; the light source modules are detachably accommodated into the storage bins and the light source modules are respectively electrically connected with the power supply module which is at least partially extended into the storage bins. a luminescent component including a substrate and at least two luminescent units disposed on the substrate, the at least two luminescent units being arranged along a circular ring; and a light distribution component including an optical element provided with an annular lens and a mounting part encircling the annular lens and being connected with the optical element and the substrate, the lens receiving emergent light of the at least two luminescent units and emitting the light after light distribution; and the mounting part being bonded to the substrate and configured to fix the optical element above the at least two luminescent units, so as to adjust illuminating light emitted by the luminescent units through the optical element and a power drive unit disposed on the substrate, the drive unit being electrically connected with the luminescent units and configured to adjust current provided for the luminescent units, wherein the storage bin is configured to accommodate the light source module wherein the number of storage bins is at least two, a number of the light source modules is at least two; the light source modules are detachably accommodated into the storage bins and the light source modules are respectively electrically connected with the power supply module which is at least partially extended into the storage bins.