The invention discloses a method for producing ceramsite from an FCC waste catalyst. The main raw materials used in the method are the FCC waste catalyst, coal ash and petrochemical alkali waste neutralizing liquid. The method comprises the steps of treating the FCC waste catalyst with liquid alkali, uniformly mixing the treated FCC waste catalyst with coal ash, finally adding a proper amount of the petrochemical alkali waste neutralizing liquid in proportion, and carrying out processes of balling, drying and calcination, so as to obtain the ceramsite. The ceramsite is produced from waste of thermal power plants and petrochemical engineering enterprises, so that the waste treatment problem of the relevant enterprises is solved, and meanwhile, the ceramsite with reliable quality and high strength can be obtained.