The utility model relates to the technical field of plane design tools, in particular to a drawing tool ruler for plane design, which comprises a straight ruler and a drawing mechanism, the drawing mechanism comprises a sliding rail, a sliding plate, an angle measuring disc, a rotating block, a frame body, a first
threaded rod, a first nut, two limiting blocks, a mounting
assembly and a fixing
assembly, the first
threaded rod penetrates through the rotating block and is rotationally connected with the rotating block, the first threaded sleeve is arranged on the outer side of the first
threaded rod and is in threaded connection with the first threaded rod, the frame body is fixedly connected with the rotating block, the mounting
assembly is arranged in the frame body, and the fixing assembly is arranged on one side of the sliding plate. The ruler is provided with the
length scale marks, the angle measuring disc is provided with the angle scale marks, through the arrangement, drawing of various lines is facilitated, the lines cannot be shielded, and therefore the practicability of the tool ruler is improved.