Ultrahigh-voltage thin-film capacitor

The utility model relates to the technical field of thin-film capacitors, in particular to an ultrahigh-voltage thin-film capacitor, which comprises an ultrahigh-voltage thin-film capacitor and two groups of vapor chambers, the vapor chambers are arranged in bilateral symmetry, and the opposite end faces of the two groups of vapor chambers are respectively provided with a first cross rod and a second cross rod. One end of the second cross rod is slidably connected to the interior of the first cross rod, a third cross rod and a fourth cross rod are arranged on the opposite end faces of the two sets of vapor chambers correspondingly, a rotating shaft is arranged on the upper end face of one end of the fourth cross rod, and a rotating disc is rotatably connected to the peripheral end face of the rotating shaft; a limiting assembly meshed with the rotating shaft is arranged in the rotating disc, multiple sets of fourth convex teeth are arranged on the peripheral end face of the rotating disc, and the ultrahigh-vo