Disclosed are a wire joint and a manufacturing method thereof. The wire joint includes a wire and a joint; the wire includes a plurality of strands of core wires and a first wire skin, each strand of the core wires is wrapped by the first wire skin, the first wire skin outside the each strand of the core wires is stripped within a threshold interval, the each strand of the core wires in the threshold interval is subjected to a tin-impregnation treatment, and an insulating wire fastener is provided between the each strand of the core wires in the threshold interval; the joint includes a connection section and an extraposition section, the insulating wire fastener is wrapped in the extraposition section, and the connection section is connected at one end of the extraposition section and wraps outside the first wire skin of the plurality of strands of core wires.