The invention relates to the technical field of installation of a small aviation antenna of an unmanned aerial vehicle, and particularly relates to an installation device for a GNSS small aviation antenna for an unmanned aerial vehicle. The installation device comprises a connecting line and an unmanned aerial vehicle body, wherein one end of the connecting line is provided with an RF (Radio Frequency) antenna connecting male head; the other end of the connecting line is provided with an RF antenna connecting female head; a screw is installed on the RF antenna connecting female head at the central position; and the middle part of the screw is externally provided with two nuts, and the nuts are matched with the screw through a thread. The installation device adopts an RF antenna connector,so that the unmanned aerial vehicle is enabled not to be subjected to interference of external signals when receiving GNSS signals; the installation device adopts a line with two joints, so that the product is enabled to have the characteristics of convenient use, light weight and compactness; the installation device adopts the antenna connector provided with an external thread and an inner hole,so that the stability and convenience of antenna connection are ensured; and the installation device adopts a short line, thereby being more practical and convenient.