PCB manufacturing method capable of preventing green oil hole plugging

Provided is a PCB (Printed Circuit Board) manufacturing method capable of preventing green oil hole plugging, comprising the steps of: (1) pre-welding treatment; (2) screen printing: forming a layer of solder resist ink on a copper layer; (3) preliminary baking: performing preheating; (4) counterpoint exposure: performing selective ultraviolet exposure on the solder resist ink covering the area needing solder resist to form a solder resist layer; (5) developing; (6) secondary counterpoint exposure: performing secondary ultraviolet exposure on the area except the function hole of a PCB; (7) secondary developing: employing chemical liquid medicine to perform secondary developing on solder resist ink in the function hole so as to thoroughly remove solder resist ink left in the function hole; (8) board checking; (9) postbaking; and (10) performing pre-welding treatment, screen printing, preliminary baking, counterpoint exposure, developing, secondary counterpoint exposure, secondary developing, board checking and