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Currently, Initiating explosive devices of domestic launch vehicle are mostly protected by installing short-circuit protection plugs. In order to release the Initiating explosive device, the short-circuit protection plug before launch vehicle launching needs to be manually removed by the electrical system, which restricts the realization of unattended electrical system. At this time, the launch vehicle has been filled with propellant, and there is?potential?safety?hazard in manual operation. In order to realize the unmanned operation of initiating explosive device release before launch of launch vehicle and improve the safety of initiating explosive device protection and release, the automatic protection and release safety control technology is proposed. In this technology, an automatic protection and release for initiating explosive device is configured in the electrical system of launch vehicle, and the magnetic latching relay is used to realize the self-maintenance of the protection circuit’s open and closed states of the initiating explosive device.This technology has been applied in the electrical system of one launch vehicle. Unattended of initiating explosive device and electrical system before launch of launch vehicle are realized, which is of great significance to improve the pre-launch process safety of launch vehicle.