Coaxial electromagnetic valve for deep sea and using method

The invention provides a coaxial electromagnetic valve for deep sea and a using method. The electromagnetic valve comprises an inlet pipe, an outlet pipe and a movable valve element used for communicating or separating the inlet pipe and the outlet pipe, the inlet pipe and the outlet pipe are coaxially arranged, and a first coil and a second coil are sequentially installed on the outer side of the movable valve element in the axial direction; magnetic steel is mounted between the first coil and the second coil, and pulse signals accessed by the first coil and the second coil are different in direction; the using method comprises the following steps that the pulse signals in different directions are connected to the first coil and the second coil at the same time and matched with the magnetic steel mounted between the first coil and the second coil, so that the movable valve element is controlled to slide, and the inlet pipe and the outlet pipe are communicated or separated; and according to the coaxial electromagnetic valve for the deep sea and the using method, the defect that an existing electromagnetic valve cannot be suitable for the deep sea environment is overcome.