Exhaust gas recycling control system of combustion device

An exhaust gas recycling control system comprising a combustion device (10) having an exhaust end (12) connected with a recycling tube (30) to an inlet end (11), the recycling tube (30) including a control valve (40) to control the recycling tube (30) being in an opened or closed state, an oxygen sensor (50) mounted on the exhaust end (12) or the recycling tube (30) to detect an oxygen content in an exhaust gas being transmitted to a controller (60) for controlling the control valve (40) based thereon, wherein, when the oxygen content of the exhaust gas is higher than a set value, the control valve (40) opens and a high oxygen content (14) of exhaust gas flows through the recycling tube (30) to the inlet end (11).