Provided is an artificial limb structure having a magnetic lock device. The artificial limb structure includes: an artificial limb coupled to a magnetic lock device; and a socket liner unit detachably coupled to the magnetic lock device, wherein the socket liner unit includes an attachment and detachment member attachable and detachable to/from the magnetic lock device by a magnetic force, and the magnetic lock device includes: permanent magnets; a magnetic flux control unit provided on the permanent magnets and transmitting the magnetic force generated by the permanent magnets to the attachment and detachment member or interrupting a transmission of the magnetic force; a magnetic force interrupting unit provided at the magnetic flux control unit and interrupting magnetic forces between permanent magnets arranged at opposite sides of the magnetic force interrupting unit; and a switch unit adjusting an arrangement of the permanent magnets with respect to the magnetic force interrupting unit.