Provided is an indoor golf putting training apparatus, which includes a golf putting pad, a target block, an effective target portion, and a stand-alone erect mirror. The golf putting pad has a flat and extensive surface, which including a first golf putting reference point which is formed at the rear side of a virtual golf putting line in the lengthy direction, a collimating point which is formed on the virtual golf putting line at the front of the first golf putting reference point, a collimating line which connects the first golf putting reference point and the collimating point, and a second golf putting reference point which is formed at the rear side of the first golf putting reference point in order to perform a high-level golf putting operation. The target block made of a hard material is installed at the most leading position of the virtual golf putting line on the golf putting pad. The effective target portion made of a sound absorption material is installed at the central portion of the target surface of the target block. The stand-alone erect mirror is located at the front line of the golf putting pad.