Modular aircraft fuel tank assembly and aircraft

The invention relates to a modular aircraft fuel tank assembly and an aircraft. The modular aircraft fuel tank assembly comprises a first fuel tank, a second fuel tank, a temperature sensor, a ventilation balance valve and an oil quantity sensor; the first fuel tank comprises a refueling port, a first fuel outlet and a first air vent; the second fuel tank comprises a first oil inlet, an oil supplyport, an oil return port and a second air vent, the first oil outlet is connected with the first oil inlet, and the first air vent is connected with the second air vent; the temperature sensor is used for detecting the temperature of fuel oil in the aircraft fuel tank assembly; the ventilation balance valve is used for balancing air pressure inside and outside the aircraft fuel tank assembly; andthe oil quantity sensor is used for detecting the oil quantity in the aircraft oil tank assembly. The modular aircraft fuel tank assembly is simple in structure and high in safety, and the range extending fuel tank is conveni