A hay bale flaking device mountable on a wheeled vehicle such as a trailer is provided. The flaking device employs a ram to translate a hay bale on a ramp, and underneath a cutting blade which at timed intervals cuts flakes of hay from the distal end of the hay bale. The timing and thickness of the flakes may be adjustably controlled. A secondary bale of hay may be carried by the device for positioning upon the ramp subsequent to use of a previous bale to make flakes.