The utility model discloses a guide rail guide piece of an automatic ladder of a shopping cart and the automatic ladder of the shopping cart. The guide rail guide piece comprises a guide plate locatedon the side face, a top plate located on the upper portion and a connecting piece connected with the guide plate and the top plate, a side plate is arranged on the side, close to the guide rail, of the guide plate, a guide head is arranged on the side, away from the guide rail, of the guide plate, and the section of the guide head is a plane or an arc. The utility model discloses a guide rail guide piece of an automatic ladder of a shopping cart. Structural design is reasonable, Parts and parts are few, by arranging the side face guide plates, the guide effect is achieved when the shopping cart enters or is transported out of the automatic ladder; The shopping cart can be ensured to correctly enter and safely go out of the automatic ladder, transportation of the shopping cart is ensured to be safely and conveniently completed, and early-stage installation and later-stage maintenance are simple and convenient by arranging the fastening rod and the fastening hole which are matched witheach other on the guide piece and the guide rail.