Special -purpose drawing board for building surveying and mapping drawing

The utility model discloses a special -purpose drawing board for building surveying and mapping drawing, including the drawing board body, first spout has been seted up in drawing board body upper surface left side, be provided with the diaphragm on the first spout, the diaphragm is made in the first buckle and first spout cooperation joint of diaphragm below through an organic whole with first spout, the second spout has been seted up on the diaphragm upper surface, be provided with the riser on the second spout, the riser is made in the second buckle and second spout cooperation joint of riser below through an organic whole with the second spout, all be provided with the scale on diaphragm and the riser upper surface, owing to all be provided with the scale on diaphragm and the riser upper surface, consequently the utility model discloses the tolerance to the drawing size can be realized, and the tolerance chi has been avoided using to brought very big convenience for the drawing personnel, measure through