Iron notch plugging device and method under iron notch mud sleeve damage state

The invention discloses an iron notch blocking device and method in an iron notch mud sleeve damage state, the iron notch blocking device comprises a cannon head and further comprises an insertion section connected with the cannon head, the section of the cannon head and the section of the insertion section are each in a circular ring shape, a stemming filling area is arranged in the cannon head, a stemming filling area is arranged in the insertion section, and the stemming filling area is arranged in the insertion section. Stemming is added into the stemming filling area through a hydraulic clay gun, the insertion section comprises a clay gun end matched with the hydraulic clay gun and a jaw part, a linear space is reserved in the stemming in the gun head, a plugging component is arranged in the linear space, and the plugging component is placed in the linear space after being filled with the hydraulic clay gun. The linear space is a circular space which is dug in a stemming area in the gun head and is 100-1