The invention relates to furniture repairing liquid. The furniture repairing liquid is prepared from 10-15 parts of saponin stock solution, 5-10 parts of olive oil, 5-10 parts of silicone emulsion, 5-10 parts of fatty glyceride, other auxiliaries and the balance industrial pure water. A preparation method of the saponin stock solution includes the following steps that (1), saponin is completely brushed by a toothbrush, the saponin is brewed in boiling water, the dry saponin is not likely to swell, and the saponin can completely swell after being brewed for 2-3 days; (2), the swelling saponin is mashed, the saponin is more easily mashed as long as the saponin is brewed to swell better, 10 folds of water is added to the mashed saponin, the material is heated, after saponin water boils, bubbling is easily generated, the saponin water is decocted with soft fires before the water is about to boil, and 30 minutes later, the fires are turned off after the saponin liquid is thick; (3), the stock solution is decolored. The nursing paint is free of toxins and emission, natural and environmentally friendly, the surface of furniture is coated with Soap/Oil, atomization is not needed, direct rubbing is carried out, and zero pollution and zero emission are achieved.