Pile foundation reinforcement cage structure suitable for stratum with uneven hardness

The utility model discloses a pile foundation reinforcement cage structure suitable for a stratum with non-uniform hardness. The pile foundation reinforcement cage structure comprises a reinforcement cage, a steel casing and a cross-shaped reinforcing rib, the reinforcement cage is arranged in a pile foundation hole, and the steel casing is arranged on the inner side of the reinforcement cage and a soft rock layer. The steel casing comprises a steel casing body and an annular movable baffle, when the annular movable baffle moves downwards along the steel casing body, a hole can be formed in a slurry protection wall of the inner wall of a pile foundation hole, concrete is poured into a reinforcement cage, and the concrete permeates into a soft rock stratum through the hole; after the annular movable baffle descends, a grouting gap is formed in the position, before descending, of the steel casing body; the cross-shaped reinforcing ribs are arranged in the steel casing body in the horizontal direction. The movab