The invention relates to a commodity output mechanism for a vending machine. The mechanism comprises a case, a driving control mechanism arranged in the case and a commodity output channel formed in the case. A movable upper baffle and a movable lower baffle are arranged in the commodity output channel. The upper baffle and the lower baffle are respectively provided with an extension position andan indentation position. Only one commodity is accommodated between the upper baffle and the lower baffle. The driving control mechanism can control the upper baffle and the lower baffle to transformbetween the extension position and the indentation position. The driving control mechanism comprises a motor, a cam rotating shaft connected with the motor, and an upper cam and a lower cam which arerespectively sleeved on the cam rotating shaft. The upper cam is a semicircular cam and the lower cam is a one-fourth circular cam. The upper cam and the lower cam are respectively opposite to the upper baffle and the lower baffle. The cam mechanism is taken as a driving mechanism to control the commodity output channel, so the commodity output mechanism has a simple structure and low cost and isconvenient to implement.