Concrete building crack width detection device

The utility model relates to the technical field of concrete crack detection, and particularly discloses a concrete building crack width detection device. Comprising a shell, a pressing plate, a bottom plate, balls and a host. A camera is fixedly connected in the shell, the bottom plate is fixedly connected to the bottom end of the shell, and the left and right side faces of the bottom plate are flush with the left and right side faces of the shell. A light hole is formed in the middle of the bottom plate, spherical grooves are formed in the left side and the right side of the bottom plate, and the balls are arranged in the spherical grooves; the pressing plates are fixedly connected to the left and right sides of the shell; curved grooves are formed in the inner sides of the bottom ends of the pressing plates; the curved-surface grooves are attached to the spherical-surface grooves, and the balls are arranged in the spherical-surface grooves; a cable protector is arranged in the middle of the top end of the