The invention relates to a magnetic absorption type measuring device for measuring temperature on an outer high-temperature metal surface, which relates to the magnetic absorption type high-temperature measuring device technical field. The invention adopts the key technology of intensifying magnetic absorption on all layers on the basis of heat insulation and provides a novel magnetic absorption type temperature-measuring device; a main magnet, a transition magnet and a conductive tube are connected in a magnetic-absorbing mode; the transition magnet is welded with the conductive tube; a thermal insulating layer is arranged between the transition magnet and a part-absorbing magnet in a thread fastening connection by magnetic conductive bolts; conducting wire is sleeved in the conductive tube; one end of the conducting wire is electrically connected with the part-absorbing magnet and the other end of the conducting wire is electrically connected with a thermoscope. The magnetic absorption type measuring device is used for measuring the temperature on the outer high-temperature metal surface, can carry out actual, direct, accurate, rapid and convenient high-temperature measurement to the outer metal surface on the spot, has simple, scientific and reasonable structure, direct measurement, convenient use, small measuring error, stable and reliable effect, convenient processing and manufacturing and low cost and makes for wide popularization and application.