The invention relates to a fixed socket with a mechanical lock and a using method thereof and belongs to the power socket technology field. A socket is arranged on a socket body, a
circular arch shellis arranged above the socket body, the
circular arch shell comprises a shell A (3) and a shell B (4), the shell A and the shell B are hinged through a rotatable bearing (1), and the mechanical lock (2) is arranged in the center of the rotatable bearing (1). A reserved gap (7) is arranged between the shell A (3) and the shell B (4), an
electric equipment plug (5) is inserted into the socket, a plug outgoing line is arranged on the
electric equipment plug, and the plug outgoing line passes through the
circular arch shell through the reserved gap (7). The socket and the method have advantages that the socket can be prevented from being accidentally hit, the socket structure is prevented from being damaged by an external force, and normal use of the socket is guaranteed; accidental touch of people such as infants and the like can be prevented, and a risk of
electric shock is reduced; and the mechanical lock is adopted to limit
authorization of a usage function of the socket.