Provided in the embodiments of the present disclosure are a restricted-rated picture detection screen method and apparatus, a display device, and a readable storage medium, the restricted-rated picture detection method comprising: in a restricted mode, performing soft decoding of a video source to be played to acquire picture frame data of the video source; using a pre-established restricted feature mode to analyse the picture frame data to acquire frame data with a restricted-rated image in the picture frame data; and, after performing mosaic processing on the restricted-rated image of the frame data, outputting the picture frame data of the video source. In the restricted-rated picture detection screen method provided by the present disclosure, during the process of displaying picture frame data on a display device, content with restricted-rated images is automatically hidden by mosaic, effectively avoiding frequent switching of different viewing modes in order to increase playback flexibility.