The present application provides a manufacturing method of a display panel and a bonding cutting device, belongs to a field of display technology, and can solve a problem of low production efficiency of display panels in the prior art. The display panel comprises a display region and a bonding region, the manufacturing method of the present application comprises steps of: cutting a display motherboard along cutting lines, and simultaneously bonding flexible circuit boards to bonding regions of the cut display panels corresponding thereto. The manufacturing method of the display panel in the present application is suitable for mass production of display panels.