The utility model discloses a from deblocking successive layer sand washing layering fracturing string, including two at least sliding sleeve sand blaster, each sliding sleeve sand blaster is located respective interval separately, the sliding sleeve sand blaster both ends are all connected from the deblocking packer through tubing nipple. Tubular column connecting the bottom from deblocking packer lower extreme through tubing nipple and accept a section of thick bamboo bottom. The tubular column tubing nipple that passes through on the deblocking packer topmost connects the water conservancy anchor, and oil pipe is connected through tubing nipple connection safety joint in water conservancy anchor upper end on. The utility model discloses can realize under the condition of motionless tubular column, realize 3 through batting 6 the fracturing piecemeal of section, sand jet both ends the force balance need not to dispose the water conservancy anchor, has reduced and has met the card risk, the packer for liquid accuse from the deblocking packer, the automatic deblocking in back is accomplished to the fracturing, greatly reduced the packer meet a calorie risk, double -deck sliding sleeve sand blaster can realize full well backwash function, when the tubular column rises to out the difficulty, can reverse well washing wash -out sand setting, and make things convenient for the tubular column to rise out.