The invention discloses an air inlet connecting
pipe of an EGR engine. The air inlet connecting
pipe comprises a
fresh air inlet single
pipe and an
exhaust gas mixing tube. The two ends of the
fresh air inlet single pipe are provided with a sharing air inlet and a sharing air outlet respectively. The sharing air inlet is connected with a device used for providing
fresh air, the sharing air outlet is connected with an air inlet pipe, and an
electronic throttle valve which is in control connection with an engine ECU is connected between the sharing air inlet and the sharing air outlet in series. The
exhaust gas mixing tube uses the sharing air inlet together with the fresh air inlet single pipe, and an air outlet of the
exhaust gas mixing tube is connected into the fresh air inlet single pipe on the upstream portion of the sharing air outlet. A Venturi tube is additionally arranged in the exhaust
gas mixing tube, an exhaust gas channel hole which is led to the inside of the Venturi tube is formed in the
throat portion of the equal
diameter of the Venturi tube, and an exhaust gas air inlet is formed in the side wall of the exhaust
gas mixing tube corresponding to the exhaust gas channel hole. According to the air inlet connecting pipe of the EGR engine, a double-channel air inlet mode is adopted, the mixing uniformity of exhaust gas and the fresh air is improved, and
nitric oxide in the exhaust gas can be effectively lowered.