A roller treatment process for total-amount steel slag treatment performed with device of claim 4, wherein: first, a slag tank tilting mechanism is used to tightly hold a slag tank containing molten slag and move the slag tank to a feeding position; and the slag tank is tilted to pour molten slag having good fluidity into a rotating roller unit through a feeding chute, thereby realizing the roller treatment; wherein a steel framework is used for the feeding chute, a substrate forms a chute frame having a top larger than a bottom; a chute wall surface directly receiving hot molten slag has an angle θ of no less than 35° relative to a horizontal plane; a heat resistant lining plate is attached to an inner wall at a side receiving the molten slag; a reinforcing rib and a supporting plate are arranged at a side opposite the side receiving the molten slag; an end face of the supporting plate contacts the chute frame, and another end face thereof contacts a stand positioned on the ground; a positioning shaft is arranged at a bottom of the chute frame, wherein the positioning shaft acts to position the feeding chute; a pin shaft is arranged at a top of the chute frame, wherein the pin shaft is used to hoist the feeding chute; a steel plate having a groove shape is arranged at the top of the chute frame for reinforcing the substrate and aiding in positioning; second, a slag removal machine is used to rake highly sticky slag or solid slag out to the roller unit when steel slag remaining in the slag tank does not have fluidity and cannot flow out, or when steel slag in the slag tank does not have fluidity and cannot flow out; third, the slag tank is tilted to a larger angle and inverted to drop remaining tank bottom slag into the roller unit, thereby achieving the total-amount steel slag treatment in a single roller unit. first, a slag tank tilting mechanism is used to tightly hold a slag tank containing molten slag and move the slag tank to a feeding position; and the slag tank is tilted to pour molten slag having good fluidity into a rotating roller unit through a feeding chute, thereby realizing the roller treatment; wherein a steel framework is used for the feeding chute, a substrate forms a chute frame having a top larger than a bottom; a chute wall surface directly receiving hot molten slag has an angle θ of no less than 35° relative to a horizontal plane; a heat resistant lining plate is attached to an inner wall at a side receiving the molten slag; a reinforcing rib and a supporting plate are arranged at a side opposite the side receiving the molten slag; an end face of the supporting plate contacts the chute frame, and another end face thereof contacts a stand positioned on the ground; a positioning shaft is arranged at a bottom of the chute frame, wherein the positioning shaft acts to position the feeding chute; a pin shaft is arranged at a top of the chute frame, wherein the pin shaft is used to hoist the feeding chute; a steel plate having a groove shape is arranged at the top of the chute frame for reinforcing the substrate and aiding in positioning; second, a slag removal machine is used to rake highly sticky slag or solid slag out to the roller unit when steel slag remaining in the slag tank does not have fluidity and cannot flow out, or when steel slag in the slag tank does not have fluidity and cannot flow out; third, the slag tank is tilted to a larger angle and inverted to drop remaining tank bottom slag into the roller unit, thereby achieving the total-amount steel slag treatment in a single roller unit.