Engine plateau test simulation device employing intake-exhaust bypassing

The utility model relates to an engine plateau test simulation device employing intake-exhaust bypassing. The engine plateau test simulation device employing intake-exhaust bypassing comprises an engine intake tube, a fan, and an air duct. The fan is a high-pressure fan. Total intake of the engine intake tube is controlled to be not smaller than the fourfold of maximum intake of an engine. Engine intake-exhaust bypassing is achieved by connecting the engine intake tube and an exhaust tube and serially connecting a one-way valve to the joint of the intake and exhaust tubes. The one-way valve is used for preventing the exhaust of the engine from flowing back into the engine intake tube during an anomaly; an intake regulating valve and the high-pressure fan are used together to feed the gas into the intake tube; the intake tube is provided with a pressure sensor in front of the one-way valve; a connection segment, connected with the engine exhaust tube, in rear of the one-way valve, is a diluting master tube; th