Connecting device for support

The utility model discloses a connecting device for support, including cross coupling mechanism and rotary buckle, cross coupling mechanism include vertical setting the pole setting sleeve, with a plurality of horizontal pole linkage units of the perpendicular setting of pole setting sleeve, every horizontal pole linkage unit includes the horizontal pole link group that two symmetries set up, and the axis of two horizontal pole link groups is on same straight line, every horizontal pole link group includes the interior pole of outband screw and takes the rotatory sleeve of internal screw thread, inner and the pole setting muffjoint of interior pole, and the outer end of interior pole is greater than its pole body, including the rotary sleeve barrel casing on the pole to outer end through interior pole is carried on spacingly, be equipped with the screw hole on the rotatory sleeve, rotary buckle sets up at the cross section of pole setting sleeve with the horizontal pole linkage unit. The utility model disclos