A suction apparatus is provided, including a suction disc unit, a shell base unit, a push obstruct unit and a flip unit. The top surface of the suction disc unit includes an upward extending traction element, with vertical surfaces forming a first teeth surface and a second teeth surface. The shell base unit is located on top of the suction disc unit. The push obstruct unit and the flip unit are located inside the shell base unit, where the flip unit is meshed with the first teeth surface and the push obstruct unit is meshed with the second teeth surface. When the flip unit is flipped downwards, the central area of the suction disc unit is dragged up so that the suction disc unit can attach to a surface via suction force. When the flip element is flipped upwards, the obstructing condition of the push obstruct unit is released so that the suction disc unit restores to a normal position.