The invention discloses an electric wire-cutting fruit tree pruning machine, which comprises a bracket mechanism, a transmission mechanism and a wire saw. The bracket mechanism includes a bottom bracket, a bracket cover and an extending handle, wherein the bracket cover is in press fitting with the bottom bracket through bolts and fixing holes, and the extending handle is disposed at one side of the bottom bracket. The transmission mechanism comprises a tension wheel, a guide wheel, a power wheel and a motor, wherein the motor is fixed at the back surface of the bottom bracket, and the tension wheel, the guide wheel and the power wheel are distributed at three corners of the bottom bracket. The annular wire saw is fitted over the tension wheel, the guide wheel and the power wheel, and the bottom edge of the wire saw is a cut edge. By using a steel wire for cutting, the inventive machine has small ineffective cutting frictional area, reduces power consumption, is light in overall weight and low in noise, can easily cut off the thick branches which cannot be cut off by the conventional pruning machine, is flexible to use, and can replace the large-sized machine such as chain saw and electric saw.