The invention discloses an automatic towel continuous serging device and a serging method thereof, and belongs to the field of towel making equipment. According to the towel continuous serging deviceand the serging method thereof, a pressing plate cooperates with a workbench to press a towel fabric to translate a towel, and the pressing plate is driven to move up and down, rotate, and move horizontally and vertically by a towel clamping and moving mechanism, so that the automatic continuous serging of edge of the towel along the outer contour of the towel on a machine head of a serging machine is realized, and the serging quality and the production efficiency of the towel are improved; in addition, the device is reasonable in structural design, convenient to automatically control, simpleand convenient to operate, and stable and reliable to move. The whole set of towel continuous serging device cooperates with a controller to control the movement process of each part; the serging process is continuous and stable, the connection is in order, and the device can be applied to serging of towels of most sizes, including square towels and towels in other shapes, can replace traditionaltowel serging equipment, and has very high promotion and use values.