A method for identifying individual objects and their number and respective locations in a sealed case creates a detection model by using standard data as a training set. Image of the sealed case is captured and divided into a specified number of detection regions. Images of first detection regions in the detection image as taken as local images and input into the detection model. The numbers and locations of target objects in the sealed case is obtained based on a statistic result outputted by the detection model. The standard data includes sample images of the sealed case with different numbers and respective locations of the target objects in the case. A capacity of the sealed case is M, and a number of the sample image is less than 2M. A target identification apparatus and a storage medium applying the method are also disclosed.