The invention provides a defect detection device and a polaroid attaching equipment. The defect detection device comprises a laser emitter and an image acquisition device, wherein the laser emitter is used for illuminating laser to the surface of a panel to be detected; the image acquisition device is used for obtaining height information of different positions in a region subjected to laser illumination according to laser reflected by the region subjected to laser illumination in the surface, and converting the height information into corresponding gray information to obtain a gray image of the region subjected to laser illumination. According to the defect detection device provided by the invention, the laser is emitted to the surface of the panel through the laser emitter at first, then the gray image of the region subjected to laser illumination is obtained according to the laser reflected by the surface of the panel to be detected through the image acquisition device, and the heights of different positions in the obtained gray image are displayed through different gray scales, so that the defect information in the illuminated region can be institutively reflected and the surface defect detection reliability of the panel is improved.