The utility model belongs to the technical field of the traffic engineering is handed over and is installed the application of executing the detection, a waveform steel beam guardrail crossbeam centerheight detection device is related to, this waveform steel beam guardrail crossbeam center height detection device includes the level bar, erects chi, magnetism arcuate contact surface, lift guider and central pivot, magnetism arcuate contact surface is through central pivot setting at the level bar tip, magnetism arcuate contact surface's centre of a circle position is arranged in the center pivot, the level bar can rotate around the axial of central pivot, lift guider sets up and links to each other on the level bar and with perpendicular chi, the drive of lift guider is erected the chi andis gone up and down along the axial of erecting the chi. The utility model provides a can accurate definite waveform steel beam guardrail crossbeam the center the position, effectively the eliminatewater leveling ruler with erect the chi because of position change or the waveform steel beam guardrail crossbeam center height detection device that influence, measuring result more accurate of personnel's shake to the detection data.