The automatic express sealing machine is a machine specially designed for the e-commerce industry to quickly seal small cardboard boxes, with a sealing speed of up to 20 boxes per minute. It adopts a double-sided belt drive, a polygonal design device to stabilize the movement seat, automatic up and down sealing, and supports the sealing of boxes 1-12, effectively preventing adverse packaging effects such as box warping and tape sealing deviation. The sealing effect is smooth and beautiful. At the same time, the automatic express sealing machine can manually adjust the width and height according to the specifications of the cardboard box, making the operation simple and convenient. Not only can it solve the problem of a large number of packages and slow packaging during the peak season of e-commerce, but it also does not require any maintenance and can be used as long as it is powered on. It can be used for standalone operation or on assembly lines with accompanying drawings.