The invention belongs to the technical field of underground mining methods and discloses a mining method for dunn-bass-containing steeply-inclined thin ore vein groups. The mining method comprises thesteps that the steeply-inclined thin ore vein groups and dunn bass layers are regarded as an integral ore mass, then the ore mass is divided into ore blocks, and the ore blocks are mined in a layeredmode; in the ore blocks, the dunn bass layers are mined through upward shallow holes, and caving waste stone is discharged from an in-vein artificial ore pass; then the ore vein groups are mined through horizontal blastholes, and caving ores are laid flatly as a stoping operation platform so as to continue operation; and operation is repeatedly conducted till mining reaches to a previous middle-section bottom column, ore block mining is finished, and ore drawing is conducted in quantity. The mining method has the technological characteristics that the advantages of a shrinkage mining method,a wall-cutting and filling mining method and a roadway type mining method are integrated, the ores can be recycled in quantity, the defects of a single mining method are overcome, and the mining efficiency can be improved greatly.