The invention provides a special PET food packaging sheet extrusion production line, which sequentially comprises a material feeding unit, a molding unit, a cooling trimming unit and a finished product collection unit from right to left, wherein the material feeding unit comprises a vacuum feeder, a material tank, a dryer and a material hopper, the molding unit comprises a rack, a support arm, a cylinder, a screen changer, a metering pump, a distributor, a mold, a three-roller calender and a double-working position laminating device, the cooling trimming unit comprises a cooling bracket, a round cutter device and a corona machine, the finished product collection unit comprises a drawing machine and a winding machine, the cylinder and the support arm are sequentially arranged on the rack, and the screen changer, the metering pump and the mold are sequentially arranged on the support arm. According to the present invention, the produced special PET food packaging sheet has characteristics of less crystal point, no whitening during plastic suction, neat winding and high comprehensive energy efficiency; and the production line can further be used for producing PS, PP, PE and other sheet materials.