A multifunctional ruler belongs to stationery and can effectively solve the problem that the stationery is various, disordered and single in functions. The multifunctional ruler comprises an outer ruler and an inner ruler and is characterized in that the outer ruler is an elongated cavity with a hollow inside and one open end, and one side of the longest edge is provided with scales. The straight side of an angle gauge is connected with the longest edge of the outer ruler, the inner ruler is located in the cavity of the outer ruler, and the position of the inner ruler same as the position of the outer ruler is provided with scales. A rotary shaft of a compass is arranged at the position of the circle center of the angle gauge, and support legs of the compass extend from the rotary shaft to two sides along the longest edge of the outer ruler. The compass is located above the angle gauge. By means of design of the compass, the angle gauge and the inner ruler, multiple functions can be achieved, and the multifunctional ruler is convenient to carry, not easily left and suitable for students.