The invention discloses a spine physiotherapy mechanism rotating back and forth along a splayed track, a physiotherapy bed and a physiotherapy chair, and relates to the fields of physiotherapy, healthcare and rehabilitation of human spine and skeleton systems. The spine physiotherapy mechanism comprises a bottom plate and a shoulder supporting plate movably arranged at the front part of the bottomplate; the bottom plate is provided with a driving mechanism which is used for driving the shoulder supporting plate to rotate back and forth in the direction perpendicular to the bottom plate alongthe splayed track; the middle of the top surface of the shoulder supporting plate is provided with a groove for supporting a rear shoulder part. Through the spine physiotherapy mechanism, the physiotherapy bed and the physiotherapy chair, a patient can carry out all-round physical therapy and exercise on the spine muscles and bones in a relaxed state.