Aiming at the electromagnetic flanging process for small aluminum alloy tube fittings, the driving coil is placed on the outside of the end of the tube, and the dual-frequency discharge current method is used to generate the attractive electromagnetic force to realize flanging in the existing method. However, its flanging ability is not strong, under this background, an attractive electromagnetic force flanging method with a magnetic field shaper is proposed. On the basis of the existing method, a magnetic field shaper is introduced, which can change the magnetic field configuration, optimize the electromagnetic force distribution and increase the axial electromagnetic force, so as to achieve the purpose of enhancing the flanging effect. To verify the feasibility of this method, firstly, the electromagnetic-structural fully coupled finite element simulation model of the tube flanging process was built, and the flanging effects after introducing different magnetic field shaper were compared, and it is concluded that the stepped magnetic field shaper has the best effect. The flanging process were analyzed under the working conditions with stepped magnetic field shaper and without magnetic field shaper. The results show that the flanging angle of the tube fittings is increased from 38° to 90° compared with the case without the magnetic field shaper. Further analysis shows that the radial component of the magnetic flux density and the annular component of the eddy current density increase to 164% and 135%, respectively. The distribution of the electromagnetic force acting on the pipe fittings changes, and the density of the axial electromagnetic force increases significantly at the peak time, increasing to 211%. The method further improves the electromagnetic flanging forming of small aluminum alloy tube fittings, and it has a certain significance for expanding the application of electromagnetic forming technology in aluminum alloy tube flanging.