Electrical plug device

An electrical plug device, comprising:

• a housing including a base wall, a slot forming wall peripherally extending from said base wall, an engaging-groove forming wall peripherally extending from said base wall and opposite to said slot forming wall, a pair of opposite side walls peripherally extending from said base wall and each bridging said slot forming wall and said engaging-groove forming wall, and at least one slot formed in said slot forming wall and extending to and meeting said base wall, said slot forming wall, said engaging-groove forming wall and said side walls cooperatively defining a receiving space that is in spatial communication with said at least one slot and that has an opening opposite to said base wall;
• a cover unit mounted on said housing and covering said opening;
• and
• a plug module mounted to said cover unit, extending into said housing and received in said receiving space, said plug module including a fixing unit mounted to said cover unit, and a plug member fixed to said cover unit by said fixing unit, and including at least one plug prong that is movably disposed in said at least one slot to pivot between a folded position, where said at least one plug prong lies in said at least one slot and has one end extending toward said base wall, and an unfolded position, where said at least one plug prong protrudes out of said at least one slot and is inclined with respect to said slot forming wall.