A Langqi raster schlieren device for measuring the surface form of object is composed of optical path elements and mechanical structure for fixing and integrating the optical path elements into one whole. Said optical path elements include laser component, splitter, reflector, collimating lens, 2D Langqi raster and camera. Said mechanical structure includes vertical sleeve barrel, transverse sleeve barrel, column, bottom plate, guide track and track holder. The gradient informations above surface form changes in x and y directions can be acquired simultaneously. Its advantages are compact structure, easy assembling and convenient operation.