Portable bridge crack width gauge based on mobile terminal regular checking system

The utility model discloses a portable bridge crack width gauge based on a mobile terminal regular checking system, which comprises a touch display screen, and a transparent protective tube is sleeved on the side wall of the touch display screen. The touch display screen has the advantages that the transparent protective tube is adopted, when the touch display screen needs to be operated and used, an operator rotates the rotary tube with the hand, when the guide rod moves to an expected angle, the operator pulls the limiting plate, when the touch ball moves to the position above the position needing to be clicked, the operator moves the limiting plate with the hand, and therefore the touch display screen can be operated and used. At the moment, the rubber tube is deformed due to collision of the guide rod, after the touch ball clicks the touch display screen, an operator loosens the limiting plate, the rubber tube collides with the guide rod, the touch ball is driven to be separated from the touch display scr