Three-flexion adjustable support cushion

The invention relates to a three-flexion adjustable support cushion and effectively solves the problem that in supine three-flexion optimal traction and acute lumbar sprain, a cotton quilt or triangular-prism sponge, which easily deforms, has poor supporting effect and non-fixed shape and is unadjustable, is unsuitable for personal specific treatment. A telescopic bar is mounted in each end of a middle cushion block, the telescopic ends of the telescopic bars are horizontally extended out of the middle cushion block along its length, the telescopic bars at the two ends of the middle cushion block are connected with a left cushion block and a right cushion block in telescopic form respectively, each of the middle cushion block, the left cushion block and the right cushion block is of big-end-down structure, and an adjustable height support is mounted at the bottom of each of the left cushion block and the right cushion block. The three-flexion adjustable support cushion is simple in structure, rarely deforms,