The invention discloses an envelope-type packaging machine, which comprises a control box, a machine cover, and a frame. Connecting, the frame is equipped with a conveying device, the conveying device includes a conveying rack, a detection side frame, a conveying frame, the conveying mount is installed and connected with the detecting side frame, the conveying frame is installed on the conveying rack, and the conveying mount includes an end frame, a conveying frame The main frame, the end frame are installed and connected with the conveying main frame, the detection side frame includes the installation of the side cover, the side mounted cross bar, the side mounted coupling shaft, the movable detection plate, the installation of the side cover and the side mounted cross bar, the installation and connection of the side mounted cross bar and the The movable detection plate is installed and connected through side-mounted shafts. The conveying device of the present invention centers the objects during conveying, reduces conveying deviation, and improves conveying efficiency. The conveying frame plays the role of adjusting the distance between objects, and the fine transmission realizes pattern printing. Clearer and more beautiful.