A sealing apparatus capable of linear and rotational motion comprising: a housing ; a hollow first shaft penetrating and coupled to the housing; a first sealing member provided between the housing and the first shaft to seal therebetween; a second shaft of which at least a part is inserted into the first shaft ; a second sealing member provided between the first shaft and the second shaft to seal therebetween; and a third sealing member provided on either an inner circumferential surface of the first shaft or an outer circumferential surface of the second shaft , wherein the first shaft is provided to be capable of linear motion in an axial direction with respect to the housing , and the second shaft is provided to be capable of rotational motion and linear motion with respect to the first shaft , and wherein the third sealing member does not perform sealing between the first shaft and the second shaft when the second shaft is in a first position in the first shaft , and performs sealing between the first shaft and the second shaft when the second shaft moves to and is in a second position in the first shaft , characterized by the fact that the third sealing member is provided on the inner circumferential surface of the first shaft , and a groove portion is provided in the second shaft to form a predetermined gap with the inner circumferential surface of the third sealing member , wherein a ring-shaped coupling ring provided separately on the second shaft is mounted on the groove portion , such that in the first position, the third sealing member does not seal between the first shaft and the second shaft , and in the second position, the third sealing member seals between the first shaft and the second shaft by contacting the coupling ring on the second shaft . a housing ; a hollow first shaft penetrating and coupled to the housing; a first sealing member provided between the housing and the first shaft to seal therebetween; a second shaft of which at least a part is inserted into the first shaft ; a second sealing member provided between the first shaft and the second shaft to seal therebetween; and a third sealing member provided on either an inner circumferential surface of the first shaft or an outer circumferential surface of the second shaft , wherein the first shaft is provided to be capable of linear motion in an axial direction with respect to the housing , and the second shaft is provided to be capable of rotational motion and linear motion with respect to the first shaft , and wherein the third sealing member does not perform sealing between the first shaft and the second shaft when the second shaft is in a first position in the first shaft , and performs sealing between the first shaft and the second shaft when the second shaft moves to and is in a second position in the first shaft , characterized by the fact that the third sealing member is provided on the inner circumferential surface of the first shaft , and a groove portion is provided in the second shaft to form a predetermined gap with the inner circumferential surface of the third sealing member , wherein a ring-shaped coupling ring provided separately on the second shaft is mounted on the groove portion , such that in the first position, the third sealing member does not seal between the first shaft and the second shaft , and in the second position, the third sealing member seals between the first shaft and the second shaft by contacting the coupling ring on the second shaft . <EOS>