An exposure machine, comprising a stage part (101), a port part (104) and a transfer mechanism; the stage part (101) comprises a working table and a sheet holder, the sheet holder being located on the working table for placing a tray (102); the port part (104) serves as a feed port and a discharge port of the exposure machine; and the transfer mechanism comprises an upper arm (107), a lower arm (108) and a movable tray guide rail (109), the tray guide rail (109) connecting the stage part (101) and the port part (104), the lower arm (108) being provided with a hook (110) for hooking the tray (102) and moving the tray (102) to the port part (104).