The invention relates to a protective device of a gas pipeline in the metallurgical industry, in particular to a glasses valve safety protection device which comprises a fixed valve body and a movable valve body of a glasses valve, wherein a valve plate is arranged between the fixed valve body and the movable valve body; the valve plate is provided with a through hole area and a blind hole area; a position locking device is arranged between the valve plate and the fixed valve body; the position locking device comprises a base I fixed on the fixed valve body, and a base II fixed on the valve plate; a fixed connecting rod is arranged between the base I and the base II. After the glasses valve safety protection device is used, a glasses valve loosening system can be completely locked, so that the glasses valve can not execute the loosening operation command, the action of the glasses valve is foundationally limited, the valve cut-off function is protected, and the glasses valve safety protection device is safer and more reliable. The device is safe, reliable and simple in structure.