An object detection method, an electronic apparatus and an object detection system are provided. The method is adapted to the electronic apparatus and includes the following steps. A first image is obtained. A geometric transformation operation is performed on the first image to obtain at least one second image. The first image and the at least one second image are combined to generate a combination image. The combination image including the first image and the at least one second image is inputted into a trained deep learning model to detect a target object.