The invention relates to a vehicle-mounted ultrashort wave wide antenna, which consists of a short radiator, a long radiator and a pedestal, wherein the bottom end of the short radiator or the long radiator is installed at the upper end of the pedestal; the short radiator consists of a radiator core, a matcher, a coupling and a glass reinforced plastic pipe; the radiator core is inserted into the upper end of the glass reinforced plastic pipe; the matcher is fixed at the middle part of the glass reinforced plastic pipe; the coupling is fixed at the lower end of the glass reinforced plastic pipe; the upper end of the matcher is connected with the lower end of the radiator core; and the lower end of the matcher is connected with the upper signal port of the pedestal. A broadband impedance matching technology is employed, the problem of antenna height is well solved and good broadband impedance matching is realized, so antenna radiation efficiency is effectively improved, and antenna gain is increased. In the invention, two radiators use a pedestal, the short radiator or the long radiator can be selected during the tactical operation in a wide zone, the short radiator can be selected during short-distance networking, or passing through bridges and tunnels and quick movement, so the antenna is convenient for the army to use to the full extent.