A plug connector includes an insulating housing of which a rear surface is provided with a plurality of insertion holes, a plurality of terminals disposed in the insulating housing and each having a soldering tail projected beyond the rear surface of the insulating housing, and a propping lid which has a base block mounted against the rear surface of the insulating housing, and a plurality of insertion bolts protruded forwards from a front face of the base block for being inserted into the corresponding insertion holes to make the propping lid detachably mounted to the insulating housing. The soldering tails can be soldered with cables respectively by means of being positioned against a top and a bottom of the base block, or directly soldered onto a printed circuit board by means of demounting the propping lid from the insulating housing to set the soldering tails free.