Full-aircraft ground resonance test liquid floatation support system

The invention relates to a full-aircraft ground resonance test liquid floatation support system, belonging to the field of aircraft aerodynamic elasticity. The system comprises pressure-bearing barrels for coating aircraft landing gear devices to support the landing gear devices, liquid storage boxes which are filled with a certain volume of liquid, and a drainage device which is connected to the liquid drainage holes at the tops of the liquid storage boxes through liquid drainage pipes, wherein the pressure-bearing barrels are placed in the liquid storage boxes and are used for offsetting the weight of an aircraft dispensed on the pressure-bearing barrels by buoyancy, the tops of the liquid storage boxes are provided with the liquid drainage holes, the aircraft is supported through the pressure-bearing barrels, the liquid storage boxes and the drainage device, and thus the test of a natural mode of vibration of the aircraft is carried out through resonance test equipment. Compared with the prior art, the sys