The embodiment of the invention provides an object detection method, a device and a computer-readable storage medium. The object detection method comprises the following steps: obtaining a bounding frame of a target object in an input image; determining a reference frame from a preset set of alternative frames according to the bounding frame; generating dimension-related features according to thedimensions of the reference frame and the bounding frame; an object detection being performed on the input image using the size-dependent features in a machine learning model. The embodiment of the invention uses the features related to the size of the object for object detection, that is, the prediction basis of the size of the object is added on the basis of the original features in the machinelearning model, and the accuracy of the object detection is further improved.