A composite granulator comprising a case body, a temporary feed storage bin, a rolling unit, a heating supply system, and a power system, wherein: said case body is provided with an air outlet, an air inlet and a bottom support frame, wherein said air inlet is disposed on said support frame in a blind form; wet and hot gases produced inside said case body are exhausted by employing manners such as exhausting said gases inside said case body, controlling induced air under enclosed negative pressure, vacuum extracting or open dissipating; said temporary feed storage bin is installed at an upper portion of said case body for placing wet materials therein; said rolling unit comprises two or more layers of roller mills, each layer of roller mills having one or more sets of roller shafts to be assembled into a single roller mill layer; said layers of roller mills are installed inside said case body and vertically arranged; said heating supply system comprises swivel joints disposed on said roller shafts of each layer of roller mills, which are matched with said air outlet and said air inlet to provide three kinds of heating supply forms, respectively steam, heat transfer oil and a hot gas; said steam and said heat transfer oil serve as indirect heat-exchanging heat sources, and said hot gas serves as a direct heat-exchanging heat source; said power system comprises a power assembly and a transmission system, said power assembly is combined by one or more sets of velocity reducers and motors, said transmission system is composed of a chain wheel, a gear wheel or a transmission shaft, and said transmission velocity is subjected to segmented control by an automatic control system. wherein baffle plates are disposed on said case body, and said baffle plates are respectively installed at two sides of each layer of roller mills, said baffle plates at one side are lengthened to be in contact with an inner wall of said case body, and said lengthened baffle plates at an upper layer and a lower layer are mutually staggered to match with an air inlet and an air outlet to form a channel of exhausting wet and hot gases. wherein a flexible stripping frame or a flexible stripping sheet is disposed on said each set of roller shafts to separate hard foreign matters contained in wet materials; and a cleaning blade is disposed below each roller shaft to clean remaining materials in a toothed groove. said case body is provided with an air outlet, an air inlet and a bottom support frame, wherein said air inlet is disposed on said support frame in a blind form; wet and hot gases produced inside said case body are exhausted by employing manners such as exhausting said gases inside said case body, controlling induced air under enclosed negative pressure, vacuum extracting or open dissipating; said temporary feed storage bin is installed at an upper portion of said case body for placing wet materials therein; said rolling unit comprises two or more layers of roller mills, each layer of roller mills having one or more sets of roller shafts to be assembled into a single roller mill layer; said layers of roller mills are installed inside said case body and vertically arranged; said heating supply system comprises swivel joints disposed on said roller shafts of each layer of roller mills, which are matched with said air outlet and said air inlet to provide three kinds of heating supply forms, respectively steam, heat transfer oil and a hot gas; said steam and said heat transfer oil serve as indirect heat-exchanging heat sources, and said hot gas serves as a direct heat-exchanging heat source; said power system comprises a power assembly and a transmission system, said power assembly is combined by one or more sets of velocity reducers and motors, said transmission system is composed of a chain wheel, a gear wheel or a transmission shaft, and said transmission velocity is subjected to segmented control by an automatic control system.