Butt joint support for reinforcement cage

The utility model discloses a reinforcement cage butt joint support which comprises a bottom support and an annular framework, the bottom support is connected to the bottom end of the annular framework, a plurality of clamping rings are evenly installed on the inner wall of the annular framework, the clamping rings are connected with the inner wall of the annular framework through connecting rods, openings are formed in the clamping rings, and the clamping rings are connected with the annular framework through the connecting rods. Movable clamping pieces are connected to the positions, located at the two ends of the opening, of the clamping ring, screw holes are formed in the two movable clamping pieces, the two movable clamping pieces are fixedly connected through connecting bolts inserted into the screw holes, and nuts are in threaded connection with the ends of the connecting bolts. According to the utility model, a plurality of steel bars can be accurately butted at the same time, so that the construction