The utility model discloses an ejection device, including the barrel and the bush body, the barrel front end is provided with machine head body, and machine head body offers the groove of running through from top to bottom of running through, and the bush body just can freely slide in running through the groove in wearing to locate to run through the groove, is equipped with a plurality of bush holes of running through the bush body on the bush body. The utility model discloses ejection device passes through the bush body bush in order to change different bores that slides in machine head body, realized the adjustment of extruding in the production process length and width of sheet, panel or flat product, has avoided the product of the different specifications of present production, needs to shut down the method of changing heavy aircraft nose, and labour saving and time saving has improved work efficiency greatly.