The utility model discloses a solenoid valve comprising a core body and a valve seat, wherein the core body is arranged on the valve seat, a core body hole and a shrinkage cavity are formed in the core body, the shrinkage cavity is arranged below the core body hole, a spring is arranged in the core body hole, a valve core component is arranged in the shrinkage cavity, the lower end of the spring props against the upper end of the valve core component, a valve port is formed on the valve seat, the lower end of the valve core component blocks the valve port, the valve core component comprises a valve core sleeve and a valve core, and the valve core sleeve is made of metal and wraps the peripheral side wall of the valve core. The solenoid valve has the advantages that as the valve core sleeve wraps the valve core, the spring can not contact with the valve core directly, so that the valve core is protected from being abraded, the service life of the solenoid valve is prolonged, and a sealing effect of the solenoid valve is ensured; and the valve core sleeve can be used for fixing the shape of the valve core, and can ensure the valve core not to deform when the valve core is influenced by a temperature, ensure the valve core not to be blocked when the valve core is heated and guarantee the operation safety of the whole equipment.