Mathematical plotter

The utility model discloses a mathematical plotter. The mathematical plotter comprises a right-angle triangular ruler 1, wherein a straight ruler 2 with length identifiers is arranged on the inclined edge of the right-angle triangular ruler 1; the straight ruler 2 and the right-angle triangular ruler 1 is of an integrated structure; a positioning sleeve 5 is arranged in the middle of the straight ruler 2; a protractor 9 is rotatably arranged on the outer circle of the positioning sleeve 5; the right-angle triangular ruler 1 is provided with an inwards concave stepped surface 91 which is matched with the protractor 9 in appearance; the height of the inwards concave stepped surface 91 is uniform with the thickness of the protractor 9; a sliding way 7 is arranged on the right side of the straight ruler 2; the section of the sliding way 7 is of an inverted T shape; a sliding plate 83 is arranged on the sliding way 7. The mathematical plotter disclosed by the utility model is simple in structure and convenient to operate; a standard horizontal line can be drawn conveniently; arithmetical operation can be carried out while pattern are drawn; the protractor 9 can be rotatably tabled to the inwards concave stepped surface 91 and then stored while being not used.