Visual detection device and method for interior of coal mine underground drilled hole

The invention belongs to the technical field of coal mine exploitation and relates to a detection device and method, in particular to a visual detection device and method for the interior of a coal mine underground drilled hole. The visual detection device comprises a communication cable drill rod, a camera drill bit, monitoring display equipment and a detector. The detector is fed into the designated position in the hole through the communication cable drill rod and the camera drill bit, the communication cable drill rod is adopted as a communication carrier to upload detected data, information such as images, natural gamma and resistivity can be observed simultaneously on hole opening monitoring equipment, then the situation in the hole is identified by comprehensively evaluating the information such as the images, the gamma and the resistivity, the accuracy of judging the complex situation in the drilled hole by site technical personnel is improved, and the foundation is laid for further construction or ac