The present invention discloses a guitar hanger apparatus, including a fixed base and a hanger body fixedly connects to the fixed base; the fixed hanger body further includes a fixing holder, applied to support the guitar and move down following the weight of the guitar, a self-locking mechanism connecting to and driven by the fixing holder; the self-locking mechanism comprises rotating shaft assemblies, built in the main body of the hanger, and swing arms connecting to the rotating shaft assemblies; the fixed holder comprises positioning casts, applied to fix the guitar, while a driving unit is arranged in the positioning cast, applied to drive the rotating shaft assemblies. The present invention achieves fixation and protection to a guitar by the weight of the guitar, which has a simple structure, and enables mass production thus brings benefits to the manufacturer.