A bulking device with two bulking heads comprises a setting hopper, an anti-blocking device disposed in the hopper, and a bulking device disposed at an exit located on the hopper bottom. The device has the technological keys that the bulking device comprises bulking screws which are symmetrically disposed on two sides of the hopper, screw rods disposed in the bulking screws, driving machines disposed at input ends of the screw rods, bulking chambers disposed on the screw rods, as well as bulking head and a charging barrel disposed on discharge holes of two ends of each bulking screw, wherein the bulking chambers on the two sides have opposite directions, and a bulking chamber is formed between the bulking screw and the bulking chamber; and an adjustment device used to compensate wear gaps of the bulking screws is disposed between a bulking shell body and the bulking head. The bulking device with the two bulking heads distributed on the two sides of a middle transmission chain is adopted; axial force on two ends are effectively offset during bulking; the bulking course is smoother; processing efficiency is increased; straws can be processed into loose, soft and fine flocculent fodder; nutrients will not be damaged; and the utilization rate of the fodder can be increased greatly.