Polyester liner, forming die and forming method thereof

The invention discloses a polyester liner, a forming die and a forming method thereof, and relates to the technical field of polyester die relevants. The polyester liner comprises a die body, the die body is provided with two cavities, and a plurality of shaping mechanisms which are clamped with one another and used for forming polyester melt are slidably installed in the cavity at one side; and a containing mechanism used for supporting the shaping mechanisms is further fixedly installed in one cavity, a plurality of heating mechanisms used for conducting heat preservation and heating on the shaping mechanisms are slidably installed in the other cavity, and a pressing mechanism used for pressing the shaping mechanisms to exhaust gas in the shaping mechanisms is fixedly installed at the upper end of the body. An injecting mechanism used for injecting the polyester melt into the shaping mechanism is arranged at one side of the pressing mechanism. According to the polyester liner, the plurality of shaping mecha