The invention discloses a multifunctional teaching aid for teaching, and relates to the technical field of math teaching aids. The multifunctional teaching aid comprises an angle ruler, wherein the angle ruler comprises a straight plate and an arc-shaped plate mounted on one side of the straight plate, angle scale marks are arranged on the arc-shaped plate, a measuring ruler is connected to the straight plate through a rotating shaft, and length scale marks are arranged on the measuring ruler. According to the teaching aid, the measuring ruler is mainly composed of a ruler a, a ruler b and a ruler c, and the three rulers are the same in width, so that the problem that a long straight line cannot be drawn on a blackboard is solved. The measuring ruler is mainly composed of the ruler a, the ruler b and the ruler c, the length of the measuring ruler is short before assembly, the length of the measuring ruler assembled by the three rulers is equal to the sum of the length of the ruler a, the length of the ruler b and the length of the ruler c, the length of the measuring ruler after assembly is long, the length of the measuring ruler before assembly cannot affect the size of the multifunctional teaching aid, and the problem that a measuring ruler is long and inconvenient to carry is solved.