The invention belongs to the technical field of coal slime sample preparation, and particularly relates to a coal slime sample preparation divider with a cutting function; the coal slime sample preparation divider comprises a cylinder body, an extrusion part and a cutting part; the top of the cylinder body is provided with a columnar bulge, and the top of the columnar bulge is provided with a clamping strip; the extrusion part comprises a push rod, the upper end of the push rod is detachably connected with a pressing plate, and the lower end of the push rod is connected with a pressing block through a connecting block. The cutting part comprises a connecting cylinder, fixed blocks are evenly distributed on an annular face of the bottom of the connecting cylinder, and limiting grooves are formed in the fixed blocks. A limiting piece is detachably installed in the limiting groove, and the end, close to the center line of the connecting cylinder, of the limiting piece is connected with ametal wire. Compared with the prior art, the divider has the following advantages that collected coal slime blocks can be shrunk with one hand, blocking can be completed in an extrusion process, and the separated coal slime can be used for sampling or using again; the whole divider is simple in structure and convenient to disassemble, assemble and clean, different cutting requirements can be met,the step of cutting with a knife again is omitted, and the production process is simplified.