The invention relates to a back brace for spinal correction and its manufacturing method. A correction brace is made according to a patient's shape, having its inside installed with plural air bags corresponding to a deformed portion and locations of reverse spinal rotation. Each air bag has an inflation valve fitted in a small through hole bored in the correction brace for a professional to inflate or deflate it to adjust pressure, laid with a soft protection cushion. An effective correction of scoliosis and reverse rotation of the vertebra can be achieved by the air bags correspondingly installed inside the correction brace to force a spinal deformed portion in three dimensions.