The invention provides a guide groove component used for an automatic door. The guide groove component comprises an external guide groove member, an internal guide groove member and a middle guide groove member positioned between the external guide groove member and the internal guide groove member, the external guide groove member, and the middle guide groove member and the internal guide groove member are slidably connected. The guide groove component is characterized in that supporting members are fixed on the upper surface and the lower surface of the internal guide groove member, a supporting member is fixed on the lower surface of the external guide groove member, and each supporting member comprises a base and a ball part protruding out of the base. By the guide groove component, correcting of linear running of a retractable door can be realized, and no extra rail needs to be laid.