The utility model discloses flexible wire-electrode cutting equipment for a steel casting riser. The flexible wire-electrode cutting equipment comprises a rope saw drive device and a bead rope. A guide wheel enabling the cutting direction of a rope saw and the cutting face of a steel casting riser to be coincident is erected between the steel casting riser and a drive wheel of the rope saw driving device. The position of the guide wheel can be adjusted according to different cutting angles. The bead rope is wound on the steel casting riser, the guide wheel, a machine-mounted guide wheel and the drive wheel of the rope saw driving device, the rope saw driving device is arranged on a rail, and the direction of the rail is coincident with the cutting direction of the rope saw. The bead rope matched with the rope saw driving device in length comprises a string of beads and a steel wire rope, the beads are formed in a manner that alloy powder serves as foundation moulds which are filled with grinding materials suitable for metal cutting, then, cold pressing molding and then hot pressed sintering molding are carried out on the grinding materials, and the beads are solidified on the steel wire rope in an injection molding or gel injection mode.