The utility model discloses a bridge detects uses flexometer, including flexometer main part, protection handle, leg joint seat, three support, rotary connecting seat, the top of flexometer main partis provided with the protection handle through the bolt fastening, and the inboard of flexometer main part is provided with the camera through rotatory fixed, and the bottom surface of flexometer mainpart is provided with flexometer rotary connecting seat, and flexometer rotary connecting seat's bottom is provided with the fixed column, and the inboard top of fixed column is provided with fixed recess, and the outside bottom of flexometer main part is provided with three support, the utility model discloses the leg joint seat of well design can be when being connected with the flexometer, directly be connected through fixed plate and fixed recess, great operating is simplified when having guaranteed original connection stability, the location rectangular pyramid can examine that time measuring runs into ground unevenness or when muddy at the flexometer, can carry out secondary fixation with its and ground through the rectangular pyramid, great increase the steadiness of flexometer.