The invention provides a method and a device for selecting a unit motor of an unconventional winding motor. The method comprises the following steps: acquiring pole pairs of the real machine, the number of slots and the number of slots per pole per phase; determining a first numerical value range according to the polar logarithm of the real machine, and randomly selecting a number of units in thefirst numerical value range; determining the number of each pole and each phase slot of the unit motor according to the number of each pole and each phase slot of the real machine; and determining thepole pair number of the unit motor and the slot number of the unit motor according to the number of the units, the pole pair number of the real machine and the slot number of the real machine. The unit motor of the non-conventional winding-connected motor selected by the invention can reflect the special wiring characteristics of the non-conventional winding, and also can simulate the true electromechanical magnetic performance. The method provides researchers with a plurality of unit motor selection schemes used for model simulation or prototype trial production of the non-conventional winding-connected motor.