The invention discloses a flexible lock sleeve sand blower which is used for multi-layer fracturing of an immovable pipe string. The flexible lock sleeve sand blower comprises a central pipe (4). Thecentral pipe (4) is provided with a sand outlet. The upper stage of a sliding sleeve (12) moves downwards to the lower stage of the central pipe (4) and is used for blocking the sand outlet of the lower stage of the central pipe (4). The flexible lock sleeve sand blower is characterized in that the lower portion of the central pipe (4) is provided with a locking mechanism; the locking mechanism isused for locking the upper stage of the sliding sleeve (12) to the interior of the lower stage of the central pipe (4) to enable the sand outlet to keep in a closed state all the time. Through the flexible lock sleeve sand blower, the problems that an existing sand blower is not provided with a sliding sleeve locking mechanism and the overflow and liquid spray phenomena still occur to an oil pipeafter fracturing are solved.