Leaking stoppage material for malignant leakage

The invention discloses a leaking stoppage material for malignant leakage, and belongs to the technical field of well drilling leaking stoppage. The leaking stoppage material for malignant leakage is composed of a dry material and a medium, the medium is common silicone oil, and 200-500 g/L of the dry material is added into a liquid medium. The dry material comprises the following components in percentage by mass: 85% of a capsule type reactant, 5% of a reaction control agent, 1%-5% of a density regulator, 3%-8% of a flow pattern regulator and 1%-2% of a pH regulator. The reactant-wrapped capsule is firstly dissolved and dissolved when meeting water in the malignant leakage formation, reactants react with each other or react when meeting water, water is rapidly absorbed and isolated, rapid foaming is achieved, large-volume closed pores are formed, and the space position is occupied; and meanwhile, glue is gradually formed in a chain mode and hardened and solidified, and leakage stoppage of the malignant leaka