The chiropractic device includes an elongated flat base, and a front stopping block and a back stropping block at the base's two ends. The front and back stopping blocks have a semi-circular cylindrical shape, with 45-degree slant support face on one end and a vertical face on the other end. Between the front and back stopping blocks, there are a main block and a number of stopping plates of different lengths. Along a top edge of the front and back stopping blocks, the main block, and the stopping plates, an end-to-end trough is provided. The chiropractic device is able to adapt its length so that users of different heights may lie on the chiropractic device for spinal relaxation and correction to the spine.