The present invention relates to a cogeneration system, and more particularly, to a cogeneration system using wood biomass fuel such as pellets or wood chips, and solid fuel such as livestock manure fuel. The present invention relates to a boiler having a heat exchanger having a combustion chamber in which solid fuel is combusted, a tank in which water is stored, a heat exchanger in communication with the combustion chamber, and a plurality of plumbing pipes disposed inside the tank, and the heat exchanger. Gas supply to the inside of the combustion chamber by mixing an economizer that heats air using the waste heat of the exhaust gas discharged from the outlet, and the air heated by the economizer and the exhaust gas purified after being discharged from the economizer A solid fuel cogeneration system comprising an apparatus, a solid fuel supply device configured to supply solid fuel to the boiler, and a steam turbine and a generator rotated by steam generated in the tank of the heat exchanger.
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