The invention relates to the technical field of splitting production of release paper, in particular to a tension control system for a splitting machine. The tension control system comprises an uncoiling raw material roll, a rubber wheel, a main motor, an upper coiling roll, an upper coiling motor, a lower coiling roll, a lower coiling motor, a cutter device, a tension adjusting unit and a guide wheel unit, wherein the cutter device and the rubber wheel are arranged in a tangential way; the tension adjusting unit consists of an upper adjusting wheel, a left adjusting wheel and a lower adjusting wheel; the axis connecting lines of the upper adjusting wheel, the left adjusting wheel and the right adjusting wheel form an equilateral triangle; the guide wheel unit consists of a front guide wheel and a back guide wheel; the left guide wheel and the back guide wheel are positioned on the same horizontal line; the axis connecting lines of the front guide wheel, the back guide wheel and the rubber wheel form an equilateral triangle. During use of the tension control system, the stability of tension control is ensured by using the stability of a triangle, thereby enhancing the stability of the tension control of spitting production equipment, and ensuring the splitting quality of release paper. The tension control system has the advantages of simple structure, reasonable setting, low manufacturing cost and the like.