The invention discloses an ultrasonic slitting machine for cloth. The structure of the ultrasonic slitting machine comprises a rotating mechanism, a control console, a fixing frame and a winding rod,wherein the rotating mechanism is provided with a cutting mechanism, transmission rods, a fixing plate and a compression mechanism. Cloth acts on bent plates to compress the bent plates, then compression rods extrude a balance rod, then a spring acts on a stress block, thus air in a sealing groove is discharged through the stress block and acts to a bent groove, fine scraps are blown to flow out from two sides, thus the fine scraps are prevented from being adhered to the slit cloth, the phenomenon that the quality of the slit cloth is poor is further avoided, the influences of the fine scrapson the cut cloth are reduced, in addition, each sliding ball is of a shaft-shaped structure, a triangular structure is distributed on the outer side of each sliding ball, then the grabbing force on the cloth is enhanced, the cloth is prevented from sliding, so that the cloth is smooth, the phenomenon of irregular slitting is avoided, the reduction of tensile strength of cloth strips is prevented,the probability of edge scattering is reduced, and the quality of the cloth is prevented from being affected.