Three-section external shape memory alloy spine orthosis

The invention discloses a three-section external shape memory alloy spine orthosis which comprises an orthosis shell and a plurality of shape memory alloy orthosis strips, the orthosis shell comprises an upper shell body, a middle shell body and a lower shell body, and the front portion of the upper shell body, the front portion of the middle shell body and the front portion of the lower shell body are connected through connecting belts; a plurality of upper clamping blocks, a plurality of middle clamping blocks and a plurality of lower clamping blocks are arranged on the back faces and the side faces of the exteriors of the upper shell, the middle shell and the lower shell correspondingly, clamping grooves are formed in the upper clamping blocks, the middle clamping blocks and the lower clamping blocks correspondingly, and the shape memory alloy correction strips penetrate through the clamping grooves of the middle clamping blocks. The two ends of the shape memory alloy correction strip are detachably arrang