The invention provides a waterproof flame-retardant ceiling coating fabric and an attaching device thereof, belongs to the technical field of fabrics and solves the problems of poor waterproof performance and poor flame retardance of the fabrics in the prior art. The waterproof flame-retardant ceiling coating fabric comprises base cloth, wherein the front side of the base cloth is sequentially provided with a flame-retardant layer, an anti-corrosion layer and a waterproof layer from bottom to top; surface cloth is attached onto the reverse surface of the base cloth through the attaching device; the surface cloth is provided with an anti-scraping layer. The attaching device of the waterproof flame-retardant ceiling coating fabric comprises a machine frame, wherein one end of the machine frame is provided with a base cloth unreeling mechanism used for conveying the base cloth; the other end of the machine frame is provided with a surface cloth unreeling mechanism used for conveying the surface cloth; a first glue coating mechanism and a second glue coating mechanism used for coating glue on the surface cloth are also arranged between the base cloth unreeling mechanism and the surface cloth unreeling mechanism; an attaching mechanism capable of attaching the base cloth and the surface cloth is arranged between the first glue coating mechanism and the second glue coating mechanism. The waterproof flame-retardant ceiling coating fabric has the advantages of waterproof performance and flame retardance.