An integrated multi-layered illuminating unit and an integrated multi-layered illuminating assembling unit are provided in the disclosure. The illuminating unit provided in the present invention can be adapted to different purposes and locations of use through a flexible number of heat dissipating bases used and adaptable assembling methods, in other words, the present invention provides an illuminating unit which can be assembled into specific forms depending on different applications and purposes. The illuminating unit and can provide various irradiation intensity and rage, wherein the heat dissipating bases are connected and assembled with each other through connecting members with an easy, fast and convenient method, thus the illuminating unit provided is very time and effort saving regarding its production and maintenance.