The invention relates a carrier mechanism for PIN automatic drilling. The mechanism comprises a power distribution control box, a vertical workbench is arranged on the power distribution control box and provided with a vertical rotating disc, a power component of the rotating disc is connected to the power distribution control box, a plurality of product carries are evenly arranged on the rotatingdisc, the workbench is provided with a drilling mechanism matched with products carried on the product carriers, the drilling mechanism comprises an axial drilling device and a radial drilling devicewhich are arranged clockwise, and the radial drilling device and the axial drilling device are connected to the power distribution control box. The vertical rotating disc is arranged, the multiple product carriers matched with a PIN are evenly arranged on the rotating disc, the different stations of the rotating disc are provided with the axial drilling device and the radial drilling device in amatched mode, two holes of a product can be machined at a time, the machining efficiency is greatly improved, and the time cost is saved.