Printing platform and screen printing machine thereof

The invention relates to the technical field of printing machines, and provides a printing platform which comprises a containing plate, a guide rail and a limiting assembly. A placing groove is formed in one side of the placing plate in the length direction of the placing plate; the guide rail is arranged on the side, away from the containing groove, of the containing plate and arranged in the width direction of the containing plate, and an inclined guide face is arranged on one side of the guide rail. The limiting assembly comprises a limiting block and a plurality of first elastic pieces; the limiting block is slidably connected to the containing groove in the length direction of the containing plate, and the side, close to the guide rail, of the limiting block extends out of the containing plate. The multiple first elastic pieces are arranged between the side, away from the guide rail, of the limiting block and the containing plate so as to drive the limiting block to abut against the guide face. Therefore