The invention relates to an automatic feeding structure for an APG (Automatic Pressure Gel) forming process. The automatic feeding structure comprises a main body material tank, a sight glass on the main body material tank, a plug valve connected below the main body material tank and a forming machine connected with the plug valve, the forming machine and a PLC (Programmable Logic Controller) work station are connected, a motor is arranged on the main body material tank, and an air intake ball valve and an air release ball valve are respectively connected with the main body material tank; the main body material tank is also connected with a safety valve, the air release ball valve is connected with a pressure valve, and air intake ball valve is connected with an air compressor through an air storage tank. The automatic feeding structure also comprises a constant pressure valve and a power valve, wherein the constant pressure valve is arranged between the air intake ball valve and the main body material tank; the power valve is arranged between the plug valve and the forming machine and is also connected with the PLC work station. The invention has the advantages of ensuring the stability of the production process, enabling the material tank to sustain certain process parameter requirements and keeping injection pressure unchanged; the invention has energy saving and consumption reduction and does not require pressure relief after applying a certain pressure to the material tank.