Multi-stage retention consolidation plugging method

The invention relates to a multi-stage retention consolidation leaking stoppage method which comprises the following steps: S1, acquiring the depth at which a drilling tool needs to be put, and descending the drilling tool to the depth position; s2, modified polyacrylamide emulsion is injected into the drilling tool; s3, strong retention leaking stoppage slurry is injected into the drilling tool; s4, consolidation plugging slurry is injected into the drilling tool; s5, drilling fluid is injected into the drilling tool, when the leaking stoppage slurry is about to flow out of the water hole of the drilling tool, the annular blowout preventer is closed, and the drilling fluid continues to be injected to replace all the leaking stoppage slurry out of the water hole of the drilling tool; and S6, after slurry replacement is completed, the drill is pulled out to the position 200-300 m above the leaking stoppage slurry level, and the drill is static and waits According to the invention, cracks or karst caves within