The invention discloses a fixed-wing automatic navigation flight control system and a using method thereof. The fixed-wing automatic navigation flight control system comprises an automatic navigation flight controller and ground station telemetry data monitoring software which are arranged on an aerocraft, wherein the automatic navigation flight controller comprises a central processing unit, a triaxial gyroscope, a triaxial acceleration sensor, a triaxial magnetic field sensor, a GPS (Global Positioning System) module, an air pressure sensor and a communication interface, the triaxial gyroscope, the triaxial acceleration sensor, the triaxial magnetic field sensor, the GPS (Global Positioning System) module, the air pressure sensor and the communication interface are respectively connected with the central processing unit, and a wireless receiving-transmitting device is mutually communicated with the central processing unit through the communicated interface; the ground station telemetry data monitoring software comprises a signal transfer plate, a data wireless transmission receiving-transmitting device, a remote controller receiver device and a USB transfer serial-port communication device, the data wireless transmission receiving-transmitting device, the remote controller receiver device and the USB transfer serial-port communication device are respectively connected with the signal transfer plate; the ground station telemetry data monitoring software is connected with the signal transfer plate through the USB transfer serial-port communication device; and the automatic navigation flight controller is communicated with the ground station telemetry data monitoring software through a wireless data transmission broadcasting station. The fixed-wing automatic navigation flight control system can accurately complete the preset flight mission and lengthen the control distance and range of a plane through a remote-control transfer control device, thereby ensuring high reliability and high stability of flight.