The present invention is a detecting structure of receptacle connector, which comprises a receptacle connector having an insulating base, multiple signal terminals and a shielding housing; at least two contact elastic clips provided respectively on both sides of the shielding housing; and at least two detecting terminals provided respectively on both sides of the insulating base, and each of the detecting terminals contacts with each of the contact elastic clips movably. Thereby, a plug connector and the receptacle connector may butt mutually for appropriate displacement between each of the contact elastic clips and each of the detecting terminals in order to perform the detection by truncating contact signals or generating contact signals to achieve the effects of simple structure, easy operation and effective detection.