The handheld UAV jamming and decoying device is a portable electronic device designed for countering UAVs. It mainly forces UAVs to lose control, return to base or land by jamming the remote control and image transmission signals as well as sending false navigation information. In this way, it prevents illegal UAV intrusion, reconnaissance or attacks, achieving rapid countermeasure and repulsion of unauthorized UAVs. It is suitable for low-altitude security needs in sensitive areas such as guard posts, military restricted zones, large-scale event venues and government agencies.