Bridge deck pavement layer construction flatness detection device and method

The invention relates to the technical field of bridge deck detection, in particular to a bridge deck pavement layer construction flatness detection device which comprises a vehicle body, a detection assembly and a marking assembly. A detection assembly is arranged at the end of the end, provided with the containing groove, of the vehicle body, the upper portion of the detection assembly is fixedly connected with the upper portion of the vehicle body, the middle of the detection assembly extends into the containing groove to be movably connected with the marking assembly, and the lower portion of the detection assembly is slidably connected with the vehicle body. The detection assembly comprises a plurality of detection cylinders, a plurality of fixing heads and a plurality of connecting levers, the upper parts of the detection cylinders are slidably connected with the fixing heads, and the lower parts of the detection cylinders are hinged to one ends of the connecting levers; the multiple marking assemblies