Provided are a metal PCB, a headlight module having the metal PCB applied thereto, and a method for assembling the headlight module, wherein the metal PCB has a base made of a metal material and configured as a thin plate, or the base has a predetermined thickness and is bent in a desired direction through a bending groove formed on the rear surface thereof, and the base has a plurality of chip mounting portions integrated thereon such that one or more LED chips are mounted thereon, the chip mounting portions being spaced at a predetermined interval and having at least two parts of incision surfaces formed on one side of the base such that the chip mounting portions are inclined and installed to have a predetermined angle with regard to the base.