Rock sample alignment loading method for true triaxial test

The invention provides a true triaxial test rock sample alignment loading method, which comprises the following steps of: firstly carrying out sample preloading alignment, then carrying out sample loading alignment to realize sample alignment loading, and setting a threshold value according to the actual condition of alignment loading to serve as an evaluation standard of alignment; meanwhile, in the sample loading stage, the driving end and the adjusting end firstly adopt a stress control mode to adjust the distance between the sample and the laser sensor in the horizontal direction and the vertical direction to be equal; when the displacement difference between the upper-end pressure sensor and the lower-end pressure sensor or the displacement difference between the left-end pressure sensor and the right-end pressure sensor is larger than a threshold value A2, the actuating mode of the adjusting end is adjusted to be displacement control, and the center position of the sample is adjusted; when the displacem