The invention discloses a use method of a shared device. The use method of the shared device comprises the steps that: the shared device sends a two-dimensional code request instruction to a server side; the two-dimensional code request instruction comprises the device identification code of the shared device; the server side generates a two-dimensional code according to the device identificationcode, and feeds back the two-dimensional code to the shared device to display; and a mobile terminal identifies the two-dimensional code displayed by the shared device, so that the shared device is unlocked. The invention further discloses a system of the shared device. By adoption of the use method and system of the shared device in the embodiment of the invention, the human cost can be reduced;the user experience can be improved; and the good sharing effect is achieved.