The invention relates to the technical field of mechanical engineering and automation, in particular to a palletizing system for product centralized palletizing and based on a robot technology. The palletizing system comprises a product input mechanism, a palletizing mechanism and a product output mechanism. The product input mechanism comprises a plurality of product temporary storing conveying lines, a plurality of product reversing conveying assemblies in matched connection with the multiple product temporary storing conveying lines correspondingly and a shaping assembly in matched connection with the multiple product reversing conveying assemblies correspondingly; and the shaping assembly comprises a shaping platform suitable for storing products. The palletizing mechanisms comprises at least one palletizing robot suitable for sucking products on the shaping platform and pallet roller ways suitable for bearing the products sucked by the robots. The product output mechanism comprises at least one RGV suitable for butting joint with the pallet roller ways, a stack outlet roller way suitable for being in bearing connection with the RGV and an output roller way. The palletizing system for product centralized palletizing and based on the robot technology can be flexibly applied to centralized palletizing of products with different specifications.