Alternating-current normally-open electromagnetic valve

The invention discloses an alternating-current normally-open electromagnetic valve. A movable iron core of the alternating-current normally-open electromagnetic valve can approach to a static iron core along the axial direction of a sleeve pipe under the drive of electromagnetic force so as to drive a blockage component to block or open a valve opening of the alternating-current normally-open electromagnetic valve; the blockage component and the movable iron core are elastically connected, so that the movable iron core still can move along an original direction until the movable iron core is jointed with the static iron core after the blockage component moves to the stroke end of the blockage component and stops. When a coil is electrified, the displacement quantity of the movable iron core and the blockage component can be inconsistent, so that the movable iron core can continuously approach to the static iron core and is tightly jointed with the static iron core finally after the blockage component contacts