A golf putter practice device for practicing repetitive ball striking develops consistent contact on an optimal position on the striking surface of a putter. The device includes a body having a top surface, a front surface, and a channel extending through the body. The channel receives a flange of the putter therein whereby the front surface of the body covers a striking surface of the putter. Alignment indicia transverse to the channel is positioned on the top surface of the body. The alignment indicia has a front section abutting and extending rearwardly from a junction of the top surface with the front surface. A fastener is coupled to the body for securing the body on the putter.