A manufacturing process for cat litter having 30 to 80 parts of weight of a powdered organic substance as the base material having particle sizes less than 840 .mu.m, 1 to 10 parts of weight of a powdered highly absorbing resin, 5 to 20 parts of weight of powders of either green tea leaves before extraction of the water soluble effective ingredient or Japanese Cypress, 3 to 10 parts of weight of a binder consisting of a highly water soluble natural macromolecule having particle sizes less than 74 .mu.m, being input into a high-speed mixer, and the mixture evenly mixed by this high-speed mixer by agitating blades rotating at a speed of 300 to 800 rpm are granulated by a granulating device, and then the granules thus obtained are dried by a drier until they become to have a bulk density of 0.20 to 0.50 g/cm.sup.3 and a water absorbing capacity of 1.3 to 3.5 times of their own weight.