The invention relates to the field of refractory matters, and particularly relates to an anti-crust wear-resistant prefabricated brick used for a feeding chamber of a cement kiln. The prefabricated brick comprises following raw materials by weight: 20-50 parts of white fused alumina, 18-30 parts of mullite M45, 15-40 parts of electrofused magnesium aluminate spinel, 10-30 parts of electrofused hercynite, 3-5 parts of zirconium carbonate, 3-5 parts of silicon carbide, 2-3 parts of silica powder, 2-8 parts of alumina micro powder, 0.1-1 part of sodium tripolyphosphate, 4-8 parts of aluminium oxynitride, 5-9 parts of Lafarge cement, 3-5 parts of a preservative liquid, 5-10 parts of a first additive bonding agent, 2-7 parts of a second additive bonding agent, 3-7 parts of a first solid additive and 1.5-6 parts of a second solid additive. The electrofused magnesium aluminate spinel comprises 15-25 parts of electrofused magnesium aluminate spinel the particle size of which is 5-8 mm, 5-20 parts of electrofused magnesium aluminate spinel the particle size of which is 3-5 mm, 5-15 parts of electrofused magnesium aluminate spinel the particle size of which is 1-3 mm and 5-15 parts of electrofused magnesium aluminate spinel the particle size of which is 0-1 mm. The prefabricated brick is high in strength. Cement clinker is not liable to adhere to the prefabricated brick. The service lifetime of the prefabricated brick is longer than 3 years.