The invention provides a quartz crucible for ingot casting and a manufacturing method thereof, which relate to the quartz crucible for polycrystalline silicon ingot casting and the manufacturing method. The method includes: (1) preparing silicon nitride slurry: uniformly mixing silicon nitride powder with mass percentage of 30-55%, organic bonder with mass percentage of 1-10%, antioxidant with mass percentage of 0-1% and pure water with mass percentage of 35-69%, and heating to temperature of 40-100 DEG C; and (2) spray coating: spraying suspension on the surface of the crucible by adopting spray coating technology, performing coating curing on the coated crucible for 1-2 hours at temperature of 80-100 DEG C, and cooling the crucible to room temperature. Adding organic bonder can lead surface adsorptivity of the crucible to be better and lead the crucible not to be damaged easily. High-temperature sintering is not required, oxidation pollution of the quartz crucible and the coating can be reduced, and energy consumption can be reduced.