Ground flatness measuring device for bridge road detection

A ground flatness measuring device for bridge road detection comprises a fixed chassis, the middle position of the top of the upper surface of the fixed chassis is fixedly connected with the bottom of a connecting cylinder, one side of the upper portion of the connecting cylinder is fixedly connected with a control box used for installing a control component, and the control box is of a hollow box body structure; a box door capable of being opened is arranged on the surface of one side; the top surface of the connecting cylinder is sleeved with a supporting column, the top of the supporting column is fixedly connected with a threaded column, a supporting plate is rotationally installed on the threaded column, a horizontal detection device is fixedly installed on the supporting plate, an infrared transmitter is fixedly installed on one side of the horizontal detection device, and the infrared transmitter is fixedly installed on the other side of the horizontal detection device. One end of the horizontal detect