Protection device for keyboard circuit

The utility model relates to a protection device of a keyboard circuit, which comprises an integral housing, a keyboard P C B board, conductive rubber, a flexible circuit board and metal dome paster, wherein the flexible circuit board and the metal dome paster are covered above the keyboard P C B board, the flexible circuit board is full of protection wires, and the protection wires are connected with a protection wire of the keyboard P C B board, metal domes on the metal dome paster are correspondingly contacted with key golden fingers on the keyboard P C B board, and holes which conveniently let the conductive rubber through are arranged on the positions of the flexible circuit board and the metal dome paste, which are corresponding to all uncovering prevention contacts. The integral housing, the uncovering prevention contacts, the conductive rubber, the keyboard P C B board and the flexible circuit board can be matched with each other to form a safety region, and all the key golden fingers on the keyboard P C B board are within the safety region, therefore, attackers can not uncover the conductive rubber integrally to attack a keyboard, and also can not attack each key on the keyboard.