This application relates to a portable sketch box for students' watercolor sketching, which includes a first connecting plate, a second connecting plate, a drawing paper layer, a telescopic easel, a first reinforcing plate, a tool layer, a second reinforcing plate, a lifting mechanism, and a telescopic guide rail , the third connecting plate, the drawing board and the drawing board bracket; the bottom of the telescopic guide rail and the telescopic easel are provided with rollers, the telescopic guide rail is provided with a slide rail, and the telescopic easel can slide on the slide rail through the roller; A connecting plate, a telescopic easel and a drawing board are all removable. The invention integrates the toolbox, easel, drawing board and bench that students need to use when sketching, which is convenient for students to carry when sketching; the telescopic easel and the first connecting plate can be assembled into a bench, and the telescopic easel, the telescopic guide rail and the drawing board can be assembled into a bench. When used in conjunction with the bracket, the height, distance and angle of the drawing board can be adjusted.