Support roller matched with working roller curve of continuous variable convex rolling mill

The invention discloses a fitting-in continuously-variable convexity rolling mill worker rollers roll shape curve backing roll, which is composed of CVC worker rollers with antisymmetric roll shape curve, up and down two backing rolls, wherein up and down backing rolls are antisymmetric roll shape curves, which is composed of four sections of odd functions along barrel length in diameter direction and carries out chamfering optimization to both extremities of body rolls; the postoptimality backing roll roll-shape curve can improve contact pressure distribution homogeneity of CVC mill space, which improves contact fatigue and concentrated wear of CVC rolling mills backing roll.