An electric connector assembly is disclosed. The electric connector assembly comprises a shell, a plurality of terminals, a spacer, a support plate, a housing, and a door. The spacer comprises a plurality of first openings. The support plate comprises a plurality of second openings. The spacer is positioned on the support plate. Each of the second openings is corresponding to one of the first openings. Each of the terminals is inserted in a corresponding first hole and a corresponding second hole. The shell is fixed to the support plate. The housing comprises two opposite sides. The shell is fixed to the housing. The door is locked to the sides. A sliding mechanism slides on the sides so that the door is closed or pulled out.