The utility model relates to a subway evacuation platform limit measuring dolly, including setting up the travelling car on two tracks, be located the pull formula that is provided with on the travelling car and measure the horizontal pole, the one end setting of measuring the horizontal pole is on the travelling car of two track center top, measure the directional boundary limit mark point of the other end of horizontal pole, be provided with the plumb bob on the travelling car, the plumb bob passes through the plumb line and is connected with the one end of measuring the horizontal pole, measure horizontal pole and travelling car rotate adjustable be connected and plane of rotation vertical, foretell measurements dolly removes when being the inclined plane to two orbital planes, connecting wire through the observation plumb bob and the contained angle between the measurement horizontal pole determine the condition whether travelling car is in the slope, if the connecting wire of plumb bob and the contained angle of measuring between the horizontal pole are the obtuse angle, measure the horizontal pole through adjusting for the vertically state is adjusted into with measuring the horizontal pole to the connecting wire of plumb bob, just so can ensure that the rod end of measuring the horizontal pole supports by on boundary limit mark point, ensures the measuring precision.