The automatic Chinese envelope machine is mainly used for processing large and medium-sized envelopes of Chinese style, and is a special equipment for producing Chinese envelopes. The utility model has the advantages of stable mechanical performance, high production efficiency, convenient adjustment, glue adding, cleaning and convenient operation, and solves the bell mouth problem which is easy to occur at the back sealing edge of the Chinese style. This gas is advanced, reasonable gas distribution, suitable for processing the following 150 grams of thick paper envelope. It is an ideal equipment for many envelope manufacturers to upgrade. The envelope machine can be Chinese and Western compatible and can process 1-9 Chinese envelopes and 2-7 western style envelopes as well as various non-standard paper bags in this range. It adopts the international popular flat type paper structure, combined with the air suction bottom out of paper, air suction cylinder, wheel conveying tank transverse folding fence, longitudinal folding mechanism of advanced quality is stable and reliable, high production efficiency, convenient adjustment, is the ideal equipment for high-volume continuous operation and many varieties of small batch processing of the envelope.