A network connector assembly includes a connection module having a housing having an opening on a rear side thereof and a plurality of elongated positioning grooves arranged in parallel on an opposing front side thereof, a wire bracket mounted in the housing near the opening and having a plurality of partition plates and a guide groove between each two adjacent partition plates, a contact holder mounted in the housing to face the wire bracket and including a base block, a plurality of positioning wire slots located on the base block corresponding to the positioning grooves and arranged at different elevations and a plurality of conducting contacts respectively mounted in the positioning wire slots and downwardly extended out of the positioning wire slots, a retainer block connected to the opening of the housing and providing a retaining plate, and a hollow cylindrical wire holder connected to the retainer block.