A line connection device is a tool required for line connection. Through the line connection device, a null line and a live line are connected and bound up at the same time, so that the line connection device is simple and quick to operate and applies to various groups of people, thereby greatly increasing the line connection speed and improving the line connection quality. The invention provides an electric wire connection device which comprises a rack, a power gear, a handle, a pressure lever, an upper pressure plate, a lower pressure plate, a locating pin and a line connection board. Lines in the line connection board are connected and sealed through the extrusion force of the upper and the lower pressure plates.