The invention discloses an air radio monitoring system based on ground remote control of a multi-rotor robot. The air radio monitoring system comprises the multi-rotor robot, a flight control unit, a directional antenna, an electronic compass, a radio monitoring reception unit, a central processing unit, a ground remote control unit and a ground control unit. The directional antenna, the electronic compass, the radio monitoring reception unit, the flight control unit and the central processing unit are all mounted on the multi-rotor robot. The central processing unit is connected with the radio monitoring reception unit and the electronic compass. The directional antenna is connected with the radio monitoring reception unit. The flight control unit is connected with the ground remote control unit. The ground remote control unit is connected with the central processing unit. The air radio monitoring system provided by the invention is low in manufacturing cost, low in flight cost, simple in structure, convenient to operate and high in safety, can control various flight attitudes of the multi-rotor robot through ground control, and can complete the radio monitoring task in the air.