The invention relates to an illumination apparatus. The illumination apparatus comprises a self-adaptive heat radiating device and an LED lamp assembly; the self-adaptive heat radiating device comprises a shell, a heat radiating assembly, a heat conducting plate and a mounting plate, wherein the heat conducting plate has a mounting surface of a regular plane structure; the mounting plate is provided with a plurality of sliding grooves, and the side wall of each sliding groove is provided with a limiting clamping groove; the LED lamp assembly comprises a plate body and an LED lamp wick; the plate body has a luminescent surface and a heat radiating surface which are oppositely arranged, the plate body is provided with a plurality of sliding blocks on the heat radiating surface, the side wallof each sliding block is provided with a limiting strip, and the heat radiating surface abuts against the mounting surface. By adopting the illumination apparatus, the LED lamp assembly can be rapidly installed and replaced, the heat radiating assembly does not need to be detached in the installation process, and the heat radiating assembly is not easy to damage; and meanwhile, by virtue of the effect of the shell, the heat radiating assembly, the heat conducting plate and the like, the heat radiating requirement of large-power LED lamp assembly can be met, the heat generated by the LED lampwick can be rapidly radiated, and the heat radiating efficiency can be improved.