The invention belongs the technical field of self-service equipment and more particularly to a self-service device and a monitoring method thereof, wherein the method comprises: determining whether the self-service device is currently in a transaction state or an idle state by acquiring the current operating state information of the self-service device; when the self-service device is currently in the transaction state, transmitting the acquired hardware equipment state information of the self-service device to the monitoring server so that the self-service device may still send the hardware equipment state information to the monitoring server when being in the transaction state.