Root-soil complex triaxial test sample preparation device and sample preparation method

The invention relates to the technical field of ecological rock and soil tests, and provides a root-soil complex triaxial test sample preparation device and a sample preparation method. The root-soil complex triaxial test sample preparation device comprises a mounting frame, a sample loading piece, a limiting piece and a pressure applying piece, wherein the sample loading piece and the limiting piece are both mounted on the mounting frame. The sample loading part comprises a limiting sleeve and a rubber part, a loading cavity is formed in the limiting sleeve, an inlet connector is arranged on the side wall of the limiting sleeve, and the inlet connector is communicated with the loading cavity. And the rubber part is nested in the inner wall of the limiting sleeve. An opening is formed in the first end of the limiting sleeve and communicates with the loading cavity, and the limiting piece is suitable for abutting against the wall face of the opening in a sealed mode. An outlet of the pressing piece is communic