An electrical connector and the buckle assembly thereof. The buckle assembly includes a stiffener provided with a frame opening for receiving an insulating body of the electrical connector, and a load plate with a rear end pivoted to the stiffener. The stiffener has a reinforce rib in front of the frame opening. The reinforce rib has a raised portion protruding upward from an upper surface of the stiffener, and an extending portion is formed by horizontally extending from the raised portion. The load plate has a through hole for receiving the chip module, a receiving hole in front of the through hole, and two receiving holes behind the through hole. Each receiving hole allows a locking member to pass therethrough to fix the load plate onto the stiffener.