Sandy soil triaxial sample preparation device

The utility model discloses a sand three-axis sample preparation device which comprises a sample preparation cylinder, the bottom end of the sample preparation cylinder is matched with a three-axis instrument base, the sample preparation cylinder is composed of two oppositely-opened arc cylinder walls, the two arc cylinder walls are tightly hooped through an annular hoop strip, and a sealing strip is arranged at the splicing position. Exhaust holes are evenly distributed in the inner walls of the two arc cylinder walls, and an arc-shaped exhaust cavity communicated with the corresponding exhaust hole is formed in the side wall of each arc cylinder wall. The inner wall of the sample preparation cylinder wall is uniformly provided with the exhaust holes instead of the exhaust grooves, the side wall is hollow to form the exhaust cavity, and the exhaust cavity is communicated with the exhaust holes and can be used for exhausting air between the rubber membrane and the sample preparation cylinder wall, so that the