An automatic vending machine includes a cabinet, a transporting device secured to the cabinet, a driving device, and a buffering device moveable received in the transporting device. The cabinet comprises a bottom panel and a first passageway located above the bottom panel. The bottom panel defines an opening. The buffering device is engaged with the driving device and comprises a hollow box. The hollow box comprises an entrance and an exit opposite to the entrance and located on the bottom panel. The entrance is aligned with the first passageway. The buffering device is moveable relative to the bottom panel by the driving device in a direction that is substantially parallel to the bottom panel, so that the hollow box is removed from the first passage to align with the opening, for the first product to move out of the bottom panel.