A prisoner seat security device includes a retractable strap which attaches to a prisoner, preferably by a restraint device on the prisoner, such as hand-cuffs. As the prisoner sits in the seat, the strap retracts. The officer can then lock the retraction mechanism so that the strap will not extend and the prisoner is held in place. When it is desired for the prisoner to get out of the chair, the lock is released, allowing the prisoner to stand and the strap to be disconnected.