The invention belongs to the technical field of automobiles, particularly relates to a lubricating system of an engine. The lubricating system comprises a check valve arranged on the output end of an oil pump; the check valve is connected with the input end of a pressure stabilizer through an oil supply pipeline; an oil pipeline connected with the output end of the pressure stabilizer is divided into two paths, one path is connected with a lubricating oil duct of the engine, and the other path is connected with a lubricating oil duct of a turbocharger; and lubricating oil is transported to anoil tank through a return pipeline after lubrication. The pressure stabilizer can reduce the pressure fluctuation of the system to stabilize oil pressure so as to reduce peak values of oil pressure in rapid acceleration of the engine and effectively ensure that oil leakage of the turbocharger caused by over-high transient oil pressure can not occur in transient conditions. The invention can protect the turbocharger in various operating conditions, thereby prolonging the service life of the turbocharger and improving the working reliability of the turbocharger.