The invention relates to the technical field of shoulder joint training devices, and discloses a flexibility shoulder joint trainer comprising a support base, wherein the support base is arranged on the ground, embedded parts located at two sides of the support base are arranged on the ground, connecting pieces are arranged at two sides of the top of the support base, the connecting pieces and theembedded parts are in threaded connection by fastening bolts and nuts, symmetric stationary shafts are fixedly arranged on the front of the support base, moving devices located on the front of the support base are movably sleeved on the stationary shafts, and fixed blocks located above the moving devices are fixedly arranged at two sides of the front of the support base. For the flexibility shoulder joint trainer, due to the action of the moving devices, a device can be conveniently carry to a designated place to be mounted and fixed, and therefore, the device conveying convenience is improved; due to the action of the support device, the moving device can be conveniently supported, so as to be convenient to mount the device, and therefore, the device arrangement reasonability is improved.