The present invention provides a wire fixing device. The wire fixing device comprises: a support device fixedly connected with a power distribution pole; a hooking mechanism fixed on the support device for hanging the wire; and a wire putting-up mechanism fixed on the support device for putting up the wire to the position of the hooking mechanism. At work, the support device is fixed on the power distribution pole, the hooking mechanism and the wire putting-up mechanism are installed on the support device, and the wire putting-up mechanism is configured to put up the wire on an insulator; when the wire is close to the hooking mechanism, the hooking mechanism goes down to hook the wire so that safe movement and fixation of the wire are realized; and at the same time, the insulator may be replaced by a worker in the condition of an electrified wire.