Crack depth measuring instrument for bridge and tunnel

A bridge tunnel crack depth measuring instrument disclosed by the present invention comprises a vehicle platform, first moving wheels are installed on the lower end face of the vehicle platform at equal intervals, a fixed rod is fixedly connected to the front end of the vehicle platform, an anti-collision fence is fixedly connected to the front end of the fixed rod, and a partition plate is installed on one side of the upper end face of the vehicle platform. A control device is installed on the other side of the upper end face of the trolley table, a lifting device is installed in the middle of the upper end face of the trolley table, a containing box is fixedly connected to the upper end of the lifting device, second moving wheels are installed on the two sides of the upper end face of the containing box, a pushing device is installed on the rear end face of the containing box, and a protection box is arranged in the middle of the upper end of the containing box. A linkage device is arranged in an inner cavi