The invention discloses an electric connector with a cover cap mechanism which turns towards the inner part of the electric connector so as to save the inner space of the electron device of the electric connector. The electric connector comprises an insulation body (1), a plurality of terminals (2) which are firmly held in the insulation body and a rotatable cover cap mechanism assembled on the insulation body; the insulation body is provided with a accommodating space (10) where a clapper is arranged and the terminals extend to the clapper; the cover cap mechanism comprises two cover caps (5) which can shroud the accommodating space and elastic components (3) and the two cover caps rotatablely enters the accommodating space when in butt jointing with the butting connector.