The invention discloses a special square grabbing disc device for straw bales, and belongs to the field of agricultural machine picking devices. The special square grabbing disc device for the straw bales solves the problems that artificial transporting and stacking efficiency is low, and the labor intensity is high. The special square grabbing disc device for the straw bales is characterized by comprising a grabbing disc rack, an overturn oil cylinder and straw hooks, and the grabbing disc rack comprises a grabbing disc rack frame and a grabbing disc rack holder, and further comprises a strawhook oil cylinder, a hanging connection device and two sets of straw hook rotating mechanisms. The two sets of straw hook rotating mechanisms are longitudinally and symmetrically arranged on the grabbing disc rack frame, the two sets of straw hook rotating mechanisms are connected through the straw hook oil cylinder, each set of straw hook rotating mechanism at least comprises two straw hook connection rods arranged on the grabbing disc rack frame in the longitudinal direction, and the multiple straw hooks are evenly distributed on the straw hook connection rods. The adjacent straw hook connection rods in each set of straw hook rotating mechanism are connected through linkage rods, and the fixed end and the piston end of the overturn oil cylinder are connected with the hanging connectiondevice and the grabbing disc holder respectively. The special square grabbing disc device for the straw bales has the beneficial effects that the device is used by cooperating with a forklift, and thedevice rapidly and efficiently achieves procedures such as grabbing, placing and stacking of big straw bales.