The invention discloses a motor rotor of a permanent magnet synchronous traction machine. The motor rotor comprises a rotor body (1) and multiple pieces of magnetic steel (2) which are circumferentially arranged on the rotor body (1), wherein pieces of N-pole magnetic steel and pieces of S-pole magnetic steel are arranged at intervals, and are inclined in different directions in the axial direction of the rotor body (1); inclined angles between the rotor body (1) and pieces of N-pole magnetic steel as well as between the rotor body (1) and pieces of S-pole magnetic steel in the axial direction are equal. The motor rotor of the permanent magnet synchronous traction machine, provided by the invention, can effectively inhibit harmonic waves of the traction machine, does not reduce the reverse electromotive force of the traction machine, and can improve the working efficiency of the traction machine.