The invention discloses a device for rapidly and uniformly preparing triaxial test soil samples and method thereof. The device comprises a consolidation forming cylinder, a consolidation forming cylinder upper cover plate, a consolidation forming cylinder base, a
piston rod, a
piston plate, rigid screws, bolts, and a drainage tube, and also is provided with a
silica gel air bag, a pneumatic threaded joint, a positioner, and an air tube. The consolidation forming cylinder is made of microporous steel
wire mesh, so that water can be drained.; Drainage holes are arranged on the consolidation forming cylinder base. Drainage holes are formed in the
piston plate and the
piston rod, so that water can be drained up and down and can be drained around the periphery when the soil sample is prepared.The positioner is arranged on the
piston rod to control the prepared soil sample height, so that the prepared soil sample density is controlled. The
silica gel air bag is placed in the consolidation cylinder, connected with the pneumatic threaded joint on the upper cover plate, and the
silica gel air bag is expanded and compressed by an
air compressor to compress the soil sample downwards, the pressure is constant, and the sample is uniform. According to the device for rapidly and uniformly preparing triaxial test soil samples and method thereof, the device is applicable to all kinds of soil,triaxial test soil samples can be prepared uniformly and rapidly, and the prepared soil sample can be applied to
triaxial compression and shearing tests.