The heat recovery system having an improved heat recovery rate according to the present invention includes a combustion cylinder that receives combustion air from the outside and combusts the fuel contained therein, a fuel supply unit for supplying fuel to the combustion cylinder, and is mounted on an upper portion of the combustion cylinder. A high temperature combustion gas generated by burning a fuel supplied from the fuel supply unit into the combustion cylinder by having a combustion gas discharge portion having a lower portion communicating with an upper portion of the combustion cylinder to discharge combustion gas generated by burning fuel in the combustion cylinder. A plurality of combustion apparatuses for discharging the combustion gas through a combustion gas discharge unit, a gas collection chamber connected to the plurality of combustion apparatuses to collect high-temperature combustion gas generated from the plurality of combustion apparatuses, and a high temperature collected in the gas collection chamber. For recovering heat by heat exchange from the supplied flue gas supplied with It characterized by comprising.
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