The invention relates to a frame-shaped student square ruler. The student square ruler is composed of two horizontal ruler bodies (1) and two vertical ruler bodies (2). Both the inside and the outside of the square ruler are provided with scales, scales of the two horizontal rulers correspond to each other, and scales of the two vertical rulers correspond to each other. Small scale holes are arranged on the edges of the horizontal rulers and the vertical rulers inside the square ruler. The student square ruler is multi-functional and versatile, can be used for measuring the length of a line segment and drawing geometric figures, horizontal and vertical lines and tables and serves as an ideal learning tool and stationery for elementary and middle school students.