The invention relates to a protective device combined by fabricated explosion-protection wall and turnover road needle, belonging to the structure engineering field. Two fabricated explosion-protection walls are combined with a turnover road needle respectively to form the protective device. Two explosion-protection walls all adopt double-layer steel face plate with internal reinforced rib. According to setting demand and weight sand and concrete are filled in it respectively. Two adjustable oblique braces are set at the back of each component. The turnover road needle has two statuses. When it is put up it is the road block to prevent vehicle impacting object directly and when it is put down it is the vehicle decelerating device. The combined device can prevent or decrease the damage effect to building structure by impact explosion of vehicle bomb. It can separate or block the protective object and the explosion source as far as possible. It can be set quickly and neatly according to different threat levels and important degree for object. It is suitable for building with design performance opened to the outside world and important building without conditions to preset protective establishment round.