Undisturbed soil sampling device

The utility model discloses an undisturbed soil sampling device, which comprises a base platform, a sampling tube, a drill pipe and a driving device, wherein one end of the sampling tube is connected with the base platform in a positioning way, and the driving device is connected with the base platform; and the output shaft of the driving device is connected with the drill pipe through a pair of gear pairs, and the drill pipe is coaxially sleeved outside the sampling tube. When the driving device drives the drill pipe to quickly drill the soil, the sampling tube does not make rotation movement, thereby avoiding changing the bulk density or structure of undisturbed soil contained in the sampling tube, and avoiding affecting the determination of soil water content caused by the moisture evaporation of the undisturbed soil due to the heat generated by the friction between the sampling tube and the soil, in order to dig real undisturbed soil and accurately obtain the physical properties of the soil.