The invention relates to a slag-filtering groove capable of increasing the resource utilization rate, and the slag-filtering groove comprises a groove body. One outer side wall of the groove body is provided with a water receiving pipe, and one end of the water receiving pipe stretches into the groove body. The side, close to the water receiving pipe, inside the groove body is provided with a flow changing device used for changing the flow direction of molten water. The end, close to the water receiving pipe, of the flow changing device is provided with an arc groove. The side wall, away from the water receiving pipe, of the groove body is provided with a water discharging mouth. The upper end of the side wall of the groove body is provided with an ultrasonic wave generating device, and the ultrasonic wave generating device emits an ultrasonic wave into the groove body. Compared with the prior art, by means of the slag-filtering groove capable of increasing the resource utilization rate, smelting molten water is subjected to slag-filtering, waste is avoided, the molten-water slag-removing efficiency is improved, and the operation of continuous-water-injection with an unsteady flow is met; and the ultrasonic wave device emits the ultrasonic wave into the groove body, undissolved blocks in the molten water can be crushed, the blocks are rapidly and completely dissolved conveniently, less scum is generated, and the resource utilization rate is increased.