NOVELTY - Recycling solar-grade polycrystalline silicon from cut slurry of monocrystalline or polycrystalline silicon comprises: (a) drying the slurry: drying the cut slurry of monocrystalline or polycrystalline silicon; (b) preparing aqueous polyethylene glycol: preparing solution, adding inorganic salt in aqueous solution, and obtaining needed solution by physical settlement; (c) carrying out the physical settlement; (d) preparing refined powder; (e) casting: placing refined powder in a molybdenum dioxide furnace, filling argon for protection, heating and cooling; and (f) carrying out purification.    USE - The process is useful for recycling solar-grade polycrystalline silicon from cut slurry of monocrystalline or polycrystalline silicon (claimed).    ADVANTAGE - The process does not bring in impure elements which are harmful to performance of high-purity alkali during purifying the high-purity alkali. Moreover, it is simple and easy to process with widely-used devices; thus, it is one of effective processes to solve the scarcity problem of silicon material and it achieves industrialization.    DETAILED DESCRIPTION - Recycling solar-grade polycrystalline silicon from cut slurry of monocrystalline or polycrystalline silicon comprises: (a) drying the slurry: drying the cut slurry of monocrystalline or polycrystalline silicon to obtain raw powder material for use; (b) preparing aqueous polyethylene glycol: preparing solution according to a mass ratio of water to the polyethylene glycol being 8-9:1, adding inorganic salt into the aqueous solution; where the dosage of the inorganic salt is 0.1-0.5% of the polyethylene glycol; and obtaining the needed solution by physical settlement; (c) carrying out the physical settlement: processing primary settlement firstly, placing the aqueous polyethylene glycol into a column-shaped vessel; adding the liquid level to 3-8 cm away from the vessel top, marking it; adding the raw powder material into the solution, mixing according to the mass ratio of the raw powder material to the solution of 1:10-15; agitating and staying for 4-6 hours; taking supernatant from the vessel; after finishing the primary settlement, repeating the operations as follows for 8-12 times: adding the aqueous polyethylene glycol prepared in (b) into the vessel to the marked position; agitating and staying for 4-6 hours, taking the supernatant from the vessel; after repeating the operations, combining all the obtained supernatant; and filtering and drying to obtain crude powder; (d) preparing refined powder: acid-washing, filtering and drying the crude powder to obtain refined powder; (e) casting: placing the refined powder into a molybdenum dioxide furnace, filling argon for protection; heating at 1500-1600 degrees C with a rate of 25-35 degrees C/minute; keeping heat for 20-30 minutes; cooling along with the furnace to obtain metal silicon ingot and carbonized silicon powder; and (f) carrying out purification: purifying the obtained metal silicon ingot to obtain the solar-grade polycrystalline silicon.