The adjustable bicycle pedal training device of the invention is a simple, easy to install device used by beginner cyclists for learning how to balance and ride a two wheel bicycle without the physical support from a non-rider and without the aid of other bicycle training devices, wherein said device replaces the customary right and left pedals on a bicycle. Each pedal member can be adjusted into two stages, wherein stage 1, stage 1 is the shortened and contracted stage, such that, said device pedals do not interfere with the motion of the rider's legs when maneuvering the bicycle forward, while the octagonally shaped design of said invention in this stage provides the beginner with eight foot pedal surfaces that facilitate and improve the pedaling and learning process. After the cyclist has developed, learned, and mastered said balancing skills, the pedal training device is then adjusted to the longer and expanded stage and utilized as standard bicycle pedals to propel said bicycle forward.