The utility model discloses an automatically controlled suspension damping ware piston machine constructs, include: a piston rod. The valve casing, it is fixed lower end of the piston rod, valve casing inside is hollow form, be provided with the inlet port on the lateral wall of valve casing to make oil storage jar epicoele and valve casing inside switch on mutually, the electro -magnet, it sets up the inside top of valve casing, the damping delivery valve, it sets up the inside lower extreme of valve casing makes valve casing inside switch on mutually with oil storage jar cavity of resorption through the damping delivery valve, movable iron core, it sets up between electro -magnet and damping delivery valve, be provided with return spring between movable iron core and the electro -magnet, the movable iron core surface is laminated with the valve casing internal surface mutually, be provided with the side opening on the movable iron core lateral wall, the internal diameter of side opening is less than the inlet port internal diameter, when side opening and inlet port dead in line when movable iron core is located the lower extreme position, the movable iron core rebound makes the inlet port complete opening when the electro -magnet is switched on.