The utility model relates to a leaching system for preparing vanadium solution by quenching roasting clinker of vanadium slag. The leaching system is provided with a material distribution hopper, a vanadium-containing solution storage tank connected with the material distribution hopper by a pipeline, and a vacuum filtration pump arranged on the pipeline, wherein a liquid outlet of the vacuum filtration pump is also respectively communicated with a liquid inlet of a first stage leaching tank and a liquid inlet of a second stage leaching tank by a pipeline; a liquid outlet of the first stage leaching tank, a liquid outlet of the second stage leaching tank and a liquid outlet of a third stage leaching tank are respectively communicated with a liquid inlet of the material distribution hopper by a pipeline; a dust collection cover is arranged above the material distribution hopper; a dust outlet of the dust collection cover is sequentially connected with a buffer tank, a drying tank and a fan by a pipeline; a liquid discharge hole of the buffer tank is communicated with a liquid inlet of the third stage leaching tank by a pipeline through the vacuum filtration pump. The leaching system has the advantages that the system is simple in structure and convenient to operate; the vanadium solution is fully enriched, the leaching efficiency of the vanadium slag is improved, and the material dust rise can be reduced in the cooling and leaching process of the roasting clinker of the vanadium slag.