The present invention relates to a fuel over-concentration lean premix type industrial gas combustor and its operation method. More specifically, in an industrial gas combustor, an oxidant supply chamber is provided with an oxidant supplied therein and an open end thereof; The output end of the oxidant supply chamber is wrapped to have a fuel chamber which is provided in the inner central part and is supplied with fuel, and a plurality of injection channels in which the oxidant of the oxidant supply chamber is introduced into the inlet end and the fuel and the oxidant are mixed and injected. block; And a fuel injection orifice provided between the fuel chamber of the injection block and each of the injection channels, in which fuel in the fuel chamber is injected into the injection channel. It is about.
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