The invention discloses a washable white carbon black photocatalyst spraying solution. According to the technical scheme, the washable white carbon black photocatalyst spraying solution is characterized by being prepared from white carbon black, acidified attapulgite, high-viscosity attapulgite, nanometer titania, nanometer silver-loaded anti-microbial powder, nanometer magnesia, nanometer zirconium dioxide, nanometer aluminum oxide, nanometer zinc oxide, polyvinyl alcohol, polyethylene glycol, polydimethylsiloxane and water. The ingredients are stirred, dispersed, emulsified, ground and then dispersed, homogenized, ground and canned to obtain the washable white carbon black photocatalyst spraying solution. The washable white carbon black photocatalyst spraying solution is applicable to being sprayed to the surface of a building or a decorative material. Under the light irradiation, formaldehyde, ammonia, benzene and other pollutants can be adsorbed and degraded continuously, and the functions of strong sterilization, deodorization, mold prevention, soil release, self-cleaning and air purification are achieved; a film coating the surface of the building or decorative material will be in the saturated state after being used for a long time, and the building or decorative material can be cleaned thoroughly through a cleaning cloth.