The invention relates to an ultra-wide band printed dipole antenna, in particular to an ultra-wide band printed dipole antenna with combined semicircular sheet oscillators capable of realizing balanced microstrip line feeding. The ultra-wide band printed dipole antenna solves the problems of poor balanced feeding performance and poor directional pattern symmetry of the existing planarized, band-ultra-widened and miniaturized ultra-wide band antenna. A left oscillator and a right oscillator of combined semicircular symmetrical oscillators are symmetrically printed on the upper surface of a dielectric plate along the centerline of the dielectric plate. A balanced microstrip line upper patch is printed on the upper surface of the dielectric plate along the length direction of the centerline of the dielectric plate. A balanced microstrip line lower patch is printed on the lower surface of the dielectric plate along the length direction of the centerline of the dielectric plate. The lower end of the balanced microstrip line lower patch is in contact with the lower edge of the dielectric plate. A metallized via is connected with the upper end of the balanced microstrip line lower patch through a metal sheet. The ultra-wide band printed dipole antenna is used for receiving and transmitting radiation signals.