Provided herein is a device for adjusting a height of a console in a vehicle. The console is configured with an upper body assembly (10) having an armrest (13), and a lower body assembly (20), and a linear guide is provided between the upper body assembly (10) and the lower body assembly (20), and a motor (50) operates the linear guide, so that the upper body assembly 10 can be vertically moved. Therefore, a height of the armrest 13 can be freely adjusted according to a passenger's physical condition.