With the number of casing damage wells in domestic oil and gas fields increases on a large scale, the problem of low accuracy in casing damage detection of Oil and gas Wells becomes increasingly serious. The Multi Finger Imaging Tool (MIT) and the Magnetic Thickness Tool (MTT) combination logging tool has unique advantages in detecting the change of casing diameter and wall thickness, but it is difficult to reflect the casing damage condition comprehensively and accurately. Considering that the VideoLog downhole TV can combine advantages with the former to make up for shortcomings, and further accurately detect casing loss, this paper proposes a visual combination logging technology scheme of MIT and MTT measurement. MIT/MTT and the VideoLog are mechanically connected by a special conversion head. The communication mode adopts the combination of downhole multi-core bus. By using parallel transmission technology and combining the characteristics of time-sharing operation of the instrument, the problem of signal transmission interference between the two is solved. It provides a set of innovative technical means of low cost, high efficiency and high value for the domestic and overseas field of coat damage detection.