The utility model discloses a be applied to waterproof phone keyboard in tunnel, including the phone keyboard, be equipped with a plurality of buttons in the middle of the phone keyboard, both ends all are equipped with protruding muscle, the groove phase block of protruding muscle and tunnel phone shell, the phone keyboard is equipped with the circuit board at the back, and the circuit board is equipped with the clamp plate at the back, clamp plate and tunnel phone shell fixed connection. The utility model discloses a phone keyboard adopts butyl rubber to adopt biconvex muscle and dual -cavity design, realized the waterproof twice outpost of the tax office, improved water -proof effects greatly. The utility model discloses an use the clamp plate to fix the circuit board in the back of phone keyboard, indirect biconvex muscle pressure tightly with the button plays the waterproof sealing effect in the dual -cavity of phone shell. Through the utility model discloses an implement, for the tunnel adverse circumstances provide the waterproof fixing device of a phone keyboard, realized the waterproof of phone keyboard and dampproofing, ensured the safe and reliable operation of equipment.