Method for improving interlayer alignment

The invention discloses a method for improving interlayer alignment, which comprises the following steps of: installing a plurality of texture cameras at the bottom of an exposure table; a plurality of alignment cameras are mounted at the upper part of the exposure table; when the PCB is conveyed to an upstream exposure table board, after the table board fixes the PCB in a vacuum manner, the alignment camera performs alignment exposure on an L2 layer; meanwhile, a texture camera alignment capture point at the bottom of the table board captures the L3-layer texture position, each texture camera captures one image, and the image is stored in a computer alignment file through data transmission; and after the L2 layer is exposed and then is overturned to the downstream of the L3 layer for exposure, and the PCB is fixed on the table board in a vacuum manner, the image processing system automatically calls out the position of the texture module captured at the upstream, normal exposure is carried out after alignmen