A self-generating foot state sensing system is suitable for connecting with an interface unit signal. The self-powered foot state sensing system includes at least one piezoelectric unit, a power storage unit, an arithmetic unit, and a wireless transmission unit. The at least one piezoelectric unit generates at least one pressure signal according to a foot pressure and is made of a piezoelectric material to generate electrical energy. The power storage unit receives and stores electrical energy. The arithmetic unit generates a foot pressure signal according to the at least one pressure signal. The wireless transmission unit generates a wireless signal according to the foot pressure signal and transmits the wireless signal to the interface unit. Both the arithmetic unit and the wireless transmission unit are capable of operating by supplying electrical energy to the power storage unit. By using the at least one piezoelectric unit as a power supply source and having a sensing function, the number of components can be saved and the cost can be reduced.一種自發電足態感測系統，適用於與一介面單元訊號連接。該自發電足態感測系統包含至少一壓電單元、一蓄電單元、一運算單元，及一無線傳輸單元。該至少一壓電單元根據一足部壓力產生至少一壓力訊號，並由壓電材料製成而產生電能。該蓄電單元接收並儲存電能。該運算單元根據該至少一壓力訊號產生一足壓訊號。該無線傳輸單元根據該足壓訊號產生一無線訊號，並發送該無線訊號至該介面單元。該運算單元及該無線傳輸單元皆由該蓄電單元供應電能而能運作。藉由該至少一壓電單元同時作為供電來源且有感測功能，能節省元件數目並降低成本。
