Contour shaping instrument for building

The utility model discloses an outline shaping instrument for building, which comprises an upper clamping plate, a lower clamping plate and a shape taking piece, a mounting cavity is arranged between the upper clamping plate and the lower clamping plate, the shape taking piece is arranged in the mounting cavity, one end of the lower clamping plate is provided with a pen holder, and the other end of the lower clamping plate is provided with a shape taking block. Under the condition that space is sufficient, a construction position is shaped through the shape taking piece, the contour shaping instrument is transversely pushed to enable the shape taking piece arranged between the upper clamping plate and the lower clamping plate to move, the shape taking piece presents the shape of the construction position, and then the shape is drawn on a material needing to be constructed according to the contour shaping instrument. When the contour shaping instrument at the construction position cannot be properly placed, th