An exhaust gas purification system comprising: an exhaust gas purification device which is arranged in an exhaust gas route of an engine; and the exhaust gas purification system being structured such that a plurality of renewing modes for burning and removing a particulate matter deposited in the exhaust gas purification device can be executed, wherein one of a plurality of renewing modes is an initialization renewing mode which supplies a fuel into the exhaust gas purification device regardless of a clogged state of the exhaust gas purification device, in the case that an accumulated drive time of the engine becomes equal to or more than a previously set time, the exhaust gas purification system further comprising renewal admittance input means which allows the execution of each of the renewing modes, characterized in that: the engine is a common rail type engine; the initialization renewing mode supplies the fuel into the exhaust gas purification device by a post injection regardless of the clogged state of the exhaust gas purification device; wherein the exhaust gas purification system further comprises: renewal advance notifying means which calls attention for promoting execution of each of the renewing modes; and wherein in the case that the renewal admittance input means is in a non-operated state under operation of the renewal advance notifying means, the initialization renewing mode is not executed, wherein the non-operated state of the renewal admittance input means carries on for a predetermined leaving time or more, the renewal advance notifying means is actuated by a warning aspect which is different from an operating aspect which promotes the execution of the initialization renewing mode, the exhaust gas purification system, further comprising: traveling system operating means which operates a traveling system of a working machine which mounts the engine thereto, wherein in the case that the renewal advance notifying means is actuated in the warning aspect, by the thereafter allowing operation of the renewal admittance input means and the operation of the traveling system operating means in correspondence to a travel stop state of the working machine, the mode is changed to an emergency renewing mode which supplies the fuel into the exhaust gas purification device by the post injection and maintains an engine rotating speed at a predetermined value. the engine is a common rail type engine; the initialization renewing mode supplies the fuel into the exhaust gas purification device by a post injection regardless of the clogged state of the exhaust gas purification device; wherein the exhaust gas purification system further comprises: renewal advance notifying means which calls attention for promoting execution of each of the renewing modes; and wherein in the case that the renewal admittance input means is in a non-operated state under operation of the renewal advance notifying means, the initialization renewing mode is not executed, wherein the non-operated state of the renewal admittance input means carries on for a predetermined leaving time or more, the renewal advance notifying means is actuated by a warning aspect which is different from an operating aspect which promotes the execution of the initialization renewing mode, renewal advance notifying means which calls attention for promoting execution of each of the renewing modes; and wherein in the case that the renewal admittance input means is in a non-operated state under operation of the renewal advance notifying means, the initialization renewing mode is not executed, wherein the non-operated state of the renewal admittance input means carries on for a predetermined leaving time or more, the renewal advance notifying means is actuated by a warning aspect which is different from an operating aspect which promotes the execution of the initialization renewing mode, the exhaust gas purification system, further comprising: traveling system operating means which operates a traveling system of a working machine which mounts the engine thereto, wherein in the case that the renewal advance notifying means is actuated in the warning aspect, by the thereafter allowing operation of the renewal admittance input means and the operation of the traveling system operating means in correspondence to a travel stop state of the working machine, the mode is changed to an emergency renewing mode which supplies the fuel into the exhaust gas purification device by the post injection and maintains an engine rotating speed at a predetermined value. traveling system operating means which operates a traveling system of a working machine which mounts the engine thereto, wherein in the case that the renewal advance notifying means is actuated in the warning aspect, by the thereafter allowing operation of the renewal admittance input means and the operation of the traveling system operating means in correspondence to a travel stop state of the working machine, the mode is changed to an emergency renewing mode which supplies the fuel into the exhaust gas purification device by the post injection and maintains an engine rotating speed at a predetermined value.