Abstract: A smart key box includes a key holding element, a housing, a power assembly, sensing units, an authentication module, and a control module. The housing is configured to contain the key holding element. The power assembly is disposed in the housing and configured to drive the key holding element to leave the housing or enter the housing along an access direction. The sensing units are disposed in the housing. When the key holding element leaves the housing or enters the housing, the key holding element is configured to trigger at least one of the sensing units. The authentication module is disposed at the housing. The control module is disposed in the housing and electrically connected with the power assembly, the sensing units, and the authentication module, and is configured to control the power assembly according to the at least one of the sensing units which is triggered.