The nonmetallic powder recycled from waste printed circuit boards（PCBs） was used in cement mortar as an admixture. The effect of the particle size of nonmetallic powder on the performance of mortar was investigated. Styrene butadiene rubber（SBR） dispersion and coupling agent were used to improve the interface between nonmetallic powder and cement paste and thus the performance of mortar prepared with nonmetallic powder. The results show that the compressive strength, flexural strength and tensile bond strength increase as the particle size of nonmetallic powder decreases; and the air content, shrinkage rate and water capillary adsorption decline with the fall of the particle size of nonmetallic powder. The air content and shrinkage rate of mortar can be reduced by the treatment of coupling agent on the nonmetallic powder. Addition of styrene butadiene rubber dispersion improves the compressive strength and water capillary adsorption of mortar. Both treatment on the nonmetallic powder with coupling agent and addition of styrene butadiene rubber dispersion can enhance the flexural strength and tensile bond strength of mortar.