The invention relates to an automatic core filling production line for three-way catalytic converters. The production line structurally comprises a transfer robot, a liner stacking mechanism, a carrier liner feeding, discharging and wrapping device, a core filling mechanism, a carrier stacking and conveying frame and a shell stacking and conveying frame, wherein the liner stacking mechanism, the carrier liner feeding, discharging and wrapping device, the core filling mechanism, the carrier stacking and conveying frame and the shell stacking and conveying frame are sequentially arranged on one side of the transfer robot, the shell stacking and conveying frame is connected with one end of a shell conveying belt, the other end of the shell conveying belt is close to the core filling mechanism, and a liner grabbing mechanism is arranged above the liner stacking mechanism and is close to the carrier liner feeding, discharging and wrapping device. The production line has the advantages that the structural design is reasonable, automatic feeding and moving of carriers, liners and shells are achieved, the liners are automatically wrapped on the outer sides of the carriers, the shells are filled with the carriers wrapped with the liners, automatic core filling production of the three-way catalytic converters is achieved, the production efficiency and production quality are effectively improved, and the production requirements can be effectively met.