The utility model relates to a concrete cushion block sets up in protective layer (2) of main atress reinforcing bar (3), and it includes base (11) and set up terrace with edge (12) on base (11) four corners, forms one between four terrace with edge (12) and base (11) upper surface and be used for placing the cross platform that (4) were netted to the crack control reinforcing bar, the bottom of base is equipped with arc recess (13) that are used for fixed main atress reinforcing bar (3). Adopt the utility model discloses a concrete cushion block can net (4) by accurate positioning crack control reinforcing bar, guarantees the relative position relation between main atress reinforcing bar, crack control reinforcing bar net and the concrete form three to reaching main atress reinforcing bar and not corroded, the protective layer can not the feather checking, drop, thereby guarantees the durability of structure, easily preparation, construction.