It is an object of the present invention to dissolve a problem that an uncomfortable feeling is given to an operator due to a shock and a change of an engine sound caused by a fluctuation of an engine torque, at the time of renewal of an exhaust gas purification device 50. An exhaust gas purification system according to the present invention is provided with the exhaust gas purification device 50 which is arranged in an exhaust gas route 77 of an engine 70, renewing devices 70, 81, 82, 117 for burning and removing a particulate matter within the exhaust gas purification device 50, renewal advance notifying means 24 which is actuated in the case that a clogged state of the exhaust gas purification device 50 becomes equal to or more than a prescribed level, and renewal informing means 24 which informs of a fact that the renewing devices 70, 81, 82, 117 are under operation. The renewal advance notifying means 24 is actuated before actuating the renewing devices 70, 81, 82, 117.