Abstract: Disclosed is a part driving structure of a coffee machine, comprising a base (1); a first part (2); a second part (3); a pushing board (4); a driving rod (5) which is connected to the bottom surface of the pushing board; a first transmission rod (6) which is pivotally connected to the rear end of the second part (3); and a second transmission rod (7) which is pivotally connected to the back of the base (1). The lower end of the driving rod (5), the rear end of the first transmission rod (6) and the front end of the second transmission rod (7) are movably sheathed on one and the same transmission shaft (8). With the action of the forward and backward horizontal movements of the pushing board (4), the second part (3) slides back and forth relative to the base (1).