A portable golf swing train apparatus which can be used on the driving range or while playing a round of golf. The apparatus includes a base which can be secured on a golf bag. When the base is positioned on the golf bag, the golf bag provides sufficient support for deploying a swing training structure in an elevated position in front of the golfer. Guiding and alignment structures are provided on the training structure for establishing a swing guiding plane, a club path guiding circle, a correct beginning stance, and correct intermediate downswing positions for the golfer's club, arms and wrists.