High-efficiency and energy-saving device of fuel engine

The invention discloses a high-efficiency and energy-saving device of a fuel engine. The high-efficiency and energy-saving device comprises a main gas inlet pipe and a main exhaust pipe. Intake gas inlets are formed in one side of the main gas inlet pipe. The outer portion of a gas inlet connecting pipe is connected with a connecting pipe in a sleeved manner. A first fixed ring is mounted on the outer portion of the joint of the gas inlet connecting pipe and the connecting pipe. A gas outlet connecting pipe is connected in the other end of the connecting pipe in a sleeved manner. The gas outlet connecting pipe is arranged on one side of the main exhaust pipe. Exhausted gas outlets are formed in one side of the main exhaust pipe. According to the high-efficiency and energy-saving device ofthe fuel engine, an exhausted gas high-temperature and high-heat pipeline of the engine is connected with and communicates with a gas inlet pipeline, and after the engine is started, a large amount ofhigh-temperature and high