Building block device for building planning general drawing

The utility model discloses an architectural planning general drawing building block device which comprises a drawing disc and a plurality of area plates, the area plates are magnetically connected to the surface of the drawing disc, and the drawing disc is composed of a first drawing board, a second drawing board, a first trapezoidal groove, a first positioning hole, a trapezoidal connecting strip, a stud, a second trapezoidal groove, a second positioning hole and a rotating shaft. The first drawing board is movably connected with the second drawing board, first trapezoidal grooves are formed in the middles of the two sides of the first drawing board, first positioning holes are formed in the two ends of each first trapezoidal groove, the second drawing board can be unfolded according to requirements during use so as to increase the overall display area of the drawing board, and the regional board is installed on the surface of the drawing board in a magnetic attraction mode; the position and size of a targe