The invention relates to a food-preparation device comprising: a container arranged to receive food to be prepared, at least one movable working member, a motor for moving the movable working member,a lid for closing the container, means for locking the lid (20) on the container, the lid (20) being arranged to be moved between: an unlocked position, and a locked position on the container. According to the invention, the food-preparation device comprises means for securing the lid lock (20), comprising: at least one locking member (53) movable between a first position and a second position, wherein the locking member (53) prevents the lid (20) from moving from the locked position to the unlocked position, a gear motor (51) for moving the locking member (53) between the first position and the second position.