The invention discloses a crack image acquisition method, a crack image detection method, computer equipment and a readable storage medium, and belongs to the technical field of computer vision. The crack image acquisition method comprises the following steps: detecting target equipment in a sample image to generate an equipment image set, detecting target components in the equipment image set togenerate a component image set, and processing the component image set to generate a crack image set; training a detection model based on the crack image set; compared with the prior art, layer-by-layer detection of a sample image and segmentation of a detection result are carried out, and target detection and semantic segmentation technologies are combined to identify cracks, so that specific pixels of the cracks can be rapidly and accurately identified instead of only identifying an external rectangular area where the pixels are located, and thus the obtained crack image is more accurate. According to the crack detection method provided by the invention, the crack detection model is trained on the basis of the crack image acquired by the crack image acquisition method, and the crack canbe quickly and accurately identified.