The backpack UAV omnidirectional interference countermeasures device forms electromagnetic signal shielding in a specific area by transmitting radio signals, blocking the reception of the UAV GPS navigation, remote control, and map transmission signals, so that the UAV cannot enter the controlled area or make it forced to land. It can be used in important places such as oil and gas depots, chemical parks, prisons, and government offices, and can also be used to guarantee large-scale activities to prevent drone invasion.