EGR engine and control method thereof

The invention discloses an EGR engine. The EGR engine comprises a gas inlet pipeline, a recovery pipeline, an exhaust pipeline and an engine body; the gas inlet pipeline is in communication with a gasinlet of the engine body, and the exhaust pipeline is in communication with an exhaust port of the engine body; the gas inlet pipeline is sequentially provided with an electronic mixing valve, a gascompressor, an intercooler and an electronic throttle valve in the gas inlet direction; a turbocharger is arranged on the exhaust pipeline; and one end of the recovery pipeline is in communication with the exhaust pipeline and located on the rear side of the turbocharger, the other end of the recovery pipeline is in communication with the gas inlet pipeline and located between the electronic mixing valve and the gas compressor, an EGR valve and an EGR cooler are arranged on the recovery pipeline, and an electronic gas release valve is connected to the part, between the two ends of the gas compressor, of the gas inlet p