An apparatus for installing LED light bar is provided. The apparatus includes a platform at which a component with a LED light bar to be installed is placed; a rotatable arm and a first driving device disposed on a side of the platform. The rotatable arm is provided with a locating member, and one end of the arm is fixed relative to the platform; the first driving device drives the arm to rotate about the fixed end from a first position to a second position. When the arm is located at the first position, the LED light bar to be installed may be placed at the arm, and the locating member may fix the LED light bar on a predetermined position of the arm; when the arm rotates to the second position, the LED light bar adheres to the surface of the component for installing the LED light bar thereon.