Online silk-screen printing production line

The utility model relates to an online silk-screen printing production line which comprises a pre-positioning device, a silk-screen printing device and a drying oven. The pre-positioning device comprises a bottom plate, a carrying device, a pre-positioning support, an even number of transverse positioning devices and two vertical positioning devices. A sliding groove is formed in the bottom plate in the length direction of the bottom plate. The carrying device comprises a vehicle body, a plurality of first cylinders and a bearing plate; the even number of transverse positioning devices are horizontally and symmetrically arranged on the pre-positioning support and located on the two sides of the hollow area; the transverse positioning device comprises a second air cylinder and a transverse positioning plate; a top plate is arranged at the top of the pre-positioning bracket; the vertical positioning device comprises a third cylinder and a vertical positioning plate; the silk-screen printing device is arranged o