The invention discloses a wire connection device. The wire connection device is characterized in that the wire connection device is formed by an external sleeve I made of insulation materials, an external sleeve II, and an internal sleeve. The external sleeve I, the external sleeve II and the internal sleeve are in threaded connection with each other. The beneficial effects are that: parts are easy to process; the wire connection device is low in cost, portable and simple to install; and circular recessed holes are arranged in the connection parts, so rain is prevented from permeating through the wire connection device so that the wire connection device is safe and reliable.