Electromagnetic valve, sphygmomanometer and wearable sphygmomanometer

The invention provides an electromagnetic valve, a sphygmomanometer and a wearable sphygmomanometer. In the electromagnetic valve, a valve body is provided with an accommodating cavity; the magnetic valve disc is arranged in the containing cavity and used for allowing or cutting off circulation of fluid. A first elastic piece and a second elastic piece are arranged in the containing cavity, the first elastic piece is fixedly connected with the magnetic valve disc on one side of the magnetic valve disc, and the second elastic piece is fixedly connected with the magnetic valve disc on the other side of the magnetic valve disc and electrically connected with the magnetic valve disc. The magnetic valve disc is powered on and cuts off fluid circulation in response to the power-on of the second elastic piece, and the magnetic valve disc is powered off and allows fluid circulation in response to the power-off of the second elastic piece. According to the electromagnetic valve, the matching relation between the magne