A method and system for picking up painted panels of different dimensions and finishes includes inserting the painted panels into a selective sorting system having two superimposed mobile conveyor sectors of a predefined length and with a driving motor for the alternate advancement in one of two directions. The two mobile conveyor sectors move vertically synchronously and are arranged alternately and in series with a fixed conveyor sector. After uploading in the selective sorting system, the painted panels are kept inside the selective sorting system for a time sufficient for drying, and are withdrawn through an upload and download system, which includes software memorizing the position of the uploaded panels, actuating the lifting and/or lowering motors of the mobile conveyor sectors, and advancing the mobile conveyor sectors and the fixed conveyor sector so as to move the panels due for a customer order, temporarily storing undesired panels in a buffer.