NOVELTY - Cultivating an anaerobic granular sludge comprises adding a sludge to an anaerobic granular sludge cultivating device, transmitting high-concentration organic waste water at a bottom of the anaerobic granular sludge cultivating device, measuring micro-moisture in the organic waste water using potassium dichromate method, and dividing anaerobic granular sludge culture process into three stages including sludge domestication stage, granular sludge stage and anaerobic granular sludge.    USE - The method is useful for cultivating an anaerobic granular sludge (claimed).    ADVANTAGE - The method is capable of efficiently and rapidly cultivating the anaerobic granular sludge with stable performance and strong capacity of adapting to changes to an external environment.    DETAILED DESCRIPTION - Cultivating an anaerobic granular sludge comprises adding a sludge to an anaerobic granular sludge cultivating device, transmitting high-concentration organic waste water at a bottom of the anaerobic granular sludge cultivating device, measuring micro-moisture in an organic waste water using potassium dichromate method in national standard GB11914-89 of the initial chemical oxygen demand (COD) value of 3000-5000 mg/l at a temperature of 35-40 degrees C and pH value of 7, alkalinity of 1000 mg/l and the volume ratio of the inoculating sludge and anaerobic granular sludge is 1:15-1:20, dividing anaerobic granular sludge culture process into three stages including sludge domestication stage for inoculating sludge domestication of anaerobic granular sludge cultivating device provided with a hydraulic retention time of 20-25 hours, measuring the anaerobic granular sludge cultivating device sampling port COD value when the COD removal rate reaches 80-90%, granular sludge stage for forming anaerobic granular sludge from the bottom of the cultivating device for 7-10 hours, where the particle size of sludge is 75-85% and the volume ratio of artificial sludge bed layer volume and anaerobic granular sludge is 1:2-1:2.5, and mature stage for increasing the water inlet load to 25.8-28.9 kg/cm2, where grain diameter of sludge is 4-5 mm. An INDEPENDENT CLAIM is included for a device for cultivating anaerobic granular sludge comprising an artificial sludge bed that is arranged inside a body and is formed in a manner that a packing support pipe is fixed between an upper support plate and a lower support plate in a penetrating manner, radial packing evenly distributed on the pipe wall of the packing support pipe, paths of inlet water distributors arranged at the bottom part of the body and connected with a water inlet pump, a water outlet pipe arranged at the upper part of the body, an overflow weir arranged on the body above the water outlet pipe, an exhaust pipe arranged on the body above the overflow weir and connected with an air collector, and a sludge pump connected to the lateral wall of the bottom part of the body is connected with a sludge collecting tank, where the upper support plate and the lower support plate are fixed together with the body through a lower fixing frame.