The invention relates to a recoverable anchor rod for drilling, anchoring and grouting and a supporting method thereof. The anchor rod comprises a hollow grouting rod body, a nut, a gasket, a tray and a hollow threaded rod body. A drill bit is arranged at the front end of the hollow threaded rod body, and the hollow threaded rod body is provided with multi-purpose holes; the hollow grouting rod body advances inwards through threads, metal nails welded to the internal surface of the front end of the hollow grouting rod body pierce an anchoring agent package inside the hollow threaded rod body, and then, an anchoring agent is mixed and is then discharged through the holes, so as to play an anchoring role; the hollow grouting rod body is used for grouting, and slurry is exported through the multi-purpose holes, so as to cement and solidify loose coal rock bodies; and the hollow threaded rod body is snapped with the wall of a drilled hole through threads on the external surface of the hollow threaded rod body, so as to strengthen an anchoring role in end parts. The one-time drilling, anchoring and grouting supporting of loose coal rocks is realized through tightening and tensioning the tail of the hollow anchor rod, so that the difficult problem that the anchor rod dose not easily enter the loose coal and rocks caused by the fact that the loose coal rocks are subjected to hole collapsing after the loose coal and rocks are subjected to drilling is solved, the load capacity of a coal body is increased, and the supporting strength for surrounding rock of a roadway is enhanced. The recoverable anchor rod for drilling, anchoring and grouting and the supporting method thereof have the advantages of simple structure, low cost, little waste, easiness in construction, and good supporting effect.