A golf putt training apparatus is provided which assists a golfer in maintaining the putter head along an intendded target line while practicing a putting stroke. The training apparatus includes a pair of mutually opposing guide rails having plurality of substantially rigid teeth projecting in the direction of the opposing guide rail which stop the putter head from advancing off the intended target line. By leaving to advance the putter head between the guide rails without engaging the rigid teeth a golfer can develop a habit of keeping the putter head on the desired target line during a putting stroke.