The invention, which relates to the technical field of lithium battery cathode materials, discloses a method for determining introduction sources of non-magnetic foreign matters in a cathode materialof a lithium ion battery. The method comprises: taking a lithium ion battery cathode material, detecting non-magnetic foreign matters in the lithium ion battery cathode material, and measuring types,shapes, and sizes of the non-magnetic foreign matters as well as the number of the foreign matters with corresponding different shapes and sizes; and on the basis of the detection data, carrying out analysis by combining the production process of the cathode material to determine introduction sources of the non-magnetic foreign matters in the lithium ion battery cathode material. According to theinvention, the method has advantages of good time and effort saving effect, simpleness, and high efficiency; the types of the non-magnetic foreign matters in the lithium ion battery cathode material as well as the number of the foreign matters with corresponding different shapes and sizes can be detected accurately; the result error is small; and the introduction sources of non-magnetic foreign matters in the cathode material can be determined accurately.