The utility model relates to an angle steel tower plug-in type signboard bracket which is characterized by comprising a suspension bracket and a fixture, wherein the suspension bracket is in a crossed structure, the upper and the lower sides, and the tail end of the left side are respectively provided with a curved furrow, and the fixture is welded on the suspension bracket; the fixture comprises a fixed fixture and a movable fixture; the fixed fixture comprises two galvanized iron plates which are welded back to back; the middle part of each galvanized iron plate is provided with a groove, and the two ends are bent; the movable fixture is a zinc iron stick of which one end is bent; and the movable fixture is installed in the groove through an anti-theft bolt. The angle steel tower plug-in type signboard bracket is provided with a double crossed structured suspension bracket, thereby being firm for installation; by arranging the movable fixture and the fixed fixture, the signboard can be conveniently installed and replaced; the angle steel tower plug-in type signboard bracket is universal, and can be clamped on the angle iron in any direction; and the utility model has obvious anti-theft function, thereby saving human resources, material resources and substantial funds.