A detachable and lockable socket includes a casing. The casing is provided with a controller, a socket unit, and a pin. The pin is connected with a silicone steel sheet. An outer periphery of the silicone steel sheet is provided with a coil. The controller is able to control the coil to be electrified or not. When the coil is electrified, the coil generates a magnetic field, enabling the pin to have a magnetic attraction force. The pin is attracted and locked to a conducting plate of a power source, avoiding looseness, disengagement and stealing.