The invention discloses a four-bar linkage opening mechanism for a charge interface cover on a grille of a battery electric vehicle. The four-bar linkage opening mechanism comprises the charge interface cover and an electronic lock device. One end of the charge interface cover is provided with a charge interface cover fixing hole, the other end of the charge interface cover is provided with a second lock pin, the middle of the charge interface cover is provided with a charge interface cover base, and a four-bar linkage device is arranged on the charge interface cover base. One side of the electronic lock device is provided with a lockhole, the bottom end of the lockhole is provided with a spring, one side of the lockhole is provided with a first lock pin, and one side of the first lock pin is provided with a connecting rod. The middle of the connecting rod is provided with an electrically telescopic rod, one end of the electrically telescopic rod is provided with a fixed steel plate, and the other end of the electrically telescopic rod is provided with a controller and a signal receiver. The four-bar linkage device is composed of a first connecting bar, a second connecting bar, a third connecting bar and a fourth connecting bar. The four-bar linkage opening mechanism can directly control opening and closing of the charge interface cover inside a vehicle cab or outside the vehicle through a key without manual operation, thus, time is saved, and convenience is brought to people.