A light emitting diode (LED) side marker lamp, comprising a punching panel with a coating, a water-proof light source module, and a through hole. The water-proof light source module is disposed below the punching panel, and the through hole is disposed on the punching panel and operates to allow light to be emitted from the water-proof light source module. A traditional cover is not needed, and the punching panel is used to replace the cover and colors thereof match with those of buildings, which improves decoration effect of the invention; secondly, as the LED side marker lamp fails, only the water-proof light source module needs to be replaced, which is convenient for maintenance and reduces cost; finally, the number of light source modules can be varied, which is flexible in use.