The utility model relates to a multi-channel large-discharge-capacity sand blower with a flowback function. The multi-channel large-discharge-capacity sand blower with the flowback function is characterized in that a thread of an inner hole of the lower end of an upper connector (1) is connected with a central pipe (4), an outer thread is connected with an adjustment ring (2), a spring (3) and a valve (5) are sequentially arranged on the outer wall of the central pipe under the adjustment ring in a sleeved mode, the lower end of the valve is located on an upper opening of a valve seat, and a thread of the outer wall of the upper end of the valve seat is further connected with a sheath; an annular cavity is formed between the valve seat (10) and the central pipe (4); a plurality of sand outlet holes (9) are formed in the wall of the central pipe (4) under the valve (5); the annular cavity is communicated with the sand outlet holes; an outer thread of the lower end of the central pipe is connected with the inner wall of a lower connector (14), and an inner thread of the lower end of the valve seat is connected with the outer wall of the lower connector; sliding sleevesare fixed in the sand outlet holes of the central pipe through pins. The multi-channel large-discharge-capacity sand blower with the flowback function can reduce abrasion of the central pipe and the valve seat, can realize four-layer fracturing without pulling string and has the flowback function.