A docking station of an electronic device includes a casing having a bearing surface, a fool-proofing set, an elastic member, a connector and a linkage member. The fool-proofing set includes a protrusion protruding from or retracting back to the bearing surface and a stopper linking up with the protrusion. The elastic member is disposed in the casing and provides an elastic force so that the protrusion protrudes from the casing normally. The connector is able to operably protrude to a bearing space above the bearing surface or retracts back. When the protrusion protrudes from the bearing surface, the stopper stops at a moving path of the linkage member so that the connector is limited inside the casing. When the protrusion retracts back, the linkage member is not stopped by the stopper so that the connector is able to operably protrude to the bearing space to connect with the electronic device.