The invention relates to a waste PCB (printed circuit board) etchant and ink liquid treatment method and apparatus. Waste PCB etchant is treated by using a transverse ionic membrane separation copper treatment apparatus, is spun and evenly sprayed to an anodic focal plane and is accelerated by an electric field and then transversely sputtered to a cationic exchange membrane, metallic copper therein is extracted, and it is possible to effectively reduce the concentration of cu2+ and pollutants on an ion exchange surface and increase treatment efficiency; waste PCB ink liquid is treated with a waste PCB ink liquid treatment apparatus, is added with a strong oxidant composed of analytically pure ferrous sulfate and hydrogen peroxide, and is subjected to laser irradiation, hydrogen peroxide photolysis and Fe2+ catalysis for effectively degrading organic matters in the waste PCB ink liquid, with COD removal rate up to higher than 93%; meanwhile, a laser thermostatic and frequency-stabilizing system is used, ensuring laser output accuracy and stability and guaranteeing treatment effect of the waste PCB ink liquid.