Grouting method after drilling of rock-entering underground continuous wall

The invention discloses a grouting method after drilling of a rock-entering underground continuous wall. The grouting method comprises the steps that S1, a plurality of grouting pipes are welded to a reinforcement cage framework, and the reinforcement cage framework is arranged downwards to the bottoms of the grouting pipes to reach the elevation positions of the bottoms of the grouting pipes; S2, water is injected into the grouting pipes; S3, bottom opening steel plates of the corresponding grouting pipes are drilled through and penetrate through the bottom of the underground continuous wall by 30-50cm; S4, after drilling is completed, a large amount of water is used for flushing sediments in drilled holes; S5, cement paste is slowly injected into replacement pipes, and clear water in the pipes is completely replaced to pipe openings; S6, the grouting pipes are connected with a pressurizing pipeline of a grouting pump; S7, the cement paste is injected into the drilled holes in the wall bottom through the gro