The invention provides an air inlet pressurizing device in an air inlet and exhaust system. The air inlet pressurizing device comprises a circular first cylinder body and a circular second cylinder body. A first high-voltage electrode is arranged between every two adjacent first blocking pieces, and a second high-voltage electrode is arranged between every two adjacent second blocking pieces. In the rotating process of a first rotating shaft and a second rotating shaft, the first high-voltage electrodes and the second high-voltage electrodes with the closest outer ends can form breakdown electric sparks. The second cylinder body is further connected with an air inlet intermediate pipe on the same side as an exhaust intermediate pipe, the air inlet intermediate pipe and the exhaust intermediate pipe are located on the two sides of the second rotating shaft correspondingly, and the air inlet intermediate pipe is directly connected with a tail section air inlet pipe. A main air inlet pipeis connected with the second cylinder body and located on the same side as a main exhaust pipe, and the main exhaust pipe and the main air inlet pipe are located on the two sides of the second rotating shaft correspondingly. The air inlet pressurizing device has the advantage that waste-gas burning can be utilized to conduct air inlet pressurizing.