A balance sandblast relates to a tool used in oilfield fracturing construction. A main body (2) is composed of an inner central tube (2-1) and an outer central tube (2-2); the inner central tube is arranged inside the outer central tube and is fixedly connected with the outer central tube; the upper end of the outer central tube is connected with the lower end of an upper joint (1); the lower end of the outer central tube is connected with the upper end of a lower joint (10); a liquid outlet (2-3) is arranged on the central part of the inner central tube; a cutting slot (2-4) is arranged on the upper end of the inner central tube; an annular groove (2-5) is arranged between the inner central tube and the outer central tube; a sliding sleeve (9) is arranged on the lower end inside the inner central tube; a jacket (4) is arranged on the upper-middle part inside the inner central tube; a liquid outlet (4-1) is arranged on the jacket. The utility model is simple in structure and solves the difficult problem that in the past, fracturing construction can not be done when the interlayer thickness is less than 2.0 m. The utility model has protective effect on the thin interlayer which is adjacent to the fracturing layer and is located on the lower part of the fracturing layer. In addition, the utility model is provided with pressure guide and balancing effects and the sand-proof jacket can prevent the damage to a bushing caused by sand-mixed liquid.