A link apparatus of a variable rear spoiler for a vehicle, may include an outer linkage coupled to a motorized rotating drive shaft, a base bracket affixed to a vehicle body and a spoiler bracket connected to a rear spoiler, wherein the outer linkage determines a withdrawal height of the rear spoiler at a fully open state of the rear spoiler, and an inner linkage positioned inside of the outer linkage and coupled to the drive shaft, the base bracket, and the spoiler bracket, wherein the inner linkage determines a withdrawal angle of the rear spoiler at the fully open state of the rear spoiler.